]> ncurses.scripts.mit.edu Git - ncurses.git/blobdiff - Ada95/aclocal.m4
ncurses 6.3 - patch 20211120
[ncurses.git] / Ada95 / aclocal.m4
index 95471b2dd5ce890dd14d72cfd6b3d3cc70412f79..c675b6a310b78d9a57a7e50d74cb32b3afe2e795 100644 (file)
@@ -1,5 +1,6 @@
 dnl***************************************************************************
-dnl Copyright (c) 2010-2015,2016 Free Software Foundation, Inc.              *
+dnl Copyright 2018-2020,2021 Thomas E. Dickey                                *
+dnl Copyright 2010-2017,2018 Free Software Foundation, Inc.                  *
 dnl                                                                          *
 dnl Permission is hereby granted, free of charge, to any person obtaining a  *
 dnl copy of this software and associated documentation files (the            *
@@ -28,14 +29,16 @@ dnl***************************************************************************
 dnl
 dnl Author: Thomas E. Dickey
 dnl
-dnl $Id: aclocal.m4,v 1.112 2016/06/25 20:30:41 tom Exp $
+dnl $Id: aclocal.m4,v 1.191 2021/11/20 19:58:23 tom Exp $
 dnl Macros used in NCURSES Ada95 auto-configuration script.
 dnl
 dnl These macros are maintained separately from NCURSES.  The copyright on
 dnl this file applies to the aggregation of macros and does not affect use of
 dnl these macros in other applications.
 dnl
-dnl See http://invisible-island.net/autoconf/ for additional information.
+dnl See these pages for additional information:
+dnl            https://invisible-island.net/autoconf/
+dnl            https://invisible-island.net/autoconf/my-autoconf.html
 dnl
 dnl ---------------------------------------------------------------------------
 dnl ---------------------------------------------------------------------------
@@ -97,10 +100,11 @@ AC_DEFUN([CF_ADD_ADAFLAGS],[
        AC_SUBST(ADAFLAGS)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_ADD_CFLAGS version: 12 updated: 2015/04/12 15:39:00
+dnl CF_ADD_CFLAGS version: 15 updated: 2020/12/31 10:54:15
 dnl -------------
 dnl Copy non-preprocessor flags to $CFLAGS, preprocessor flags to $CPPFLAGS
-dnl The second parameter if given makes this macro verbose.
+dnl $1 = flags to add
+dnl $2 = if given makes this macro verbose.
 dnl
 dnl Put any preprocessor definitions that use quoted strings in $EXTRA_CPPFLAGS,
 dnl to simplify use of $CPPFLAGS in compiler checks, etc., that are easily
@@ -114,23 +118,23 @@ cf_new_extra_cppflags=
 
 for cf_add_cflags in $1
 do
-case $cf_fix_cppflags in
+case "$cf_fix_cppflags" in
 (no)
-       case $cf_add_cflags in
+       case "$cf_add_cflags" in
        (-undef|-nostdinc*|-I*|-D*|-U*|-E|-P|-C)
-               case $cf_add_cflags in
+               case "$cf_add_cflags" in
                (-D*)
-                       cf_tst_cflags=`echo ${cf_add_cflags} |sed -e 's/^-D[[^=]]*='\''\"[[^"]]*//'`
+                       cf_tst_cflags=`echo "${cf_add_cflags}" |sed -e 's/^-D[[^=]]*='\''\"[[^"]]*//'`
 
                        test "x${cf_add_cflags}" != "x${cf_tst_cflags}" \
                                && test -z "${cf_tst_cflags}" \
                                && cf_fix_cppflags=yes
 
-                       if test $cf_fix_cppflags = yes ; then
-                               cf_new_extra_cppflags="$cf_new_extra_cppflags $cf_add_cflags"
+                       if test "$cf_fix_cppflags" = yes ; then
+                               CF_APPEND_TEXT(cf_new_extra_cppflags,$cf_add_cflags)
                                continue
                        elif test "${cf_tst_cflags}" = "\"'" ; then
-                               cf_new_extra_cppflags="$cf_new_extra_cppflags $cf_add_cflags"
+                               CF_APPEND_TEXT(cf_new_extra_cppflags,$cf_add_cflags)
                                continue
                        fi
                        ;;
@@ -139,25 +143,25 @@ case $cf_fix_cppflags in
                (*$cf_add_cflags)
                        ;;
                (*)
-                       case $cf_add_cflags in
+                       case "$cf_add_cflags" in
                        (-D*)
                                cf_tst_cppflags=`echo "x$cf_add_cflags" | sed -e 's/^...//' -e 's/=.*//'`
                                CF_REMOVE_DEFINE(CPPFLAGS,$CPPFLAGS,$cf_tst_cppflags)
                                ;;
                        esac
-                       cf_new_cppflags="$cf_new_cppflags $cf_add_cflags"
+                       CF_APPEND_TEXT(cf_new_cppflags,$cf_add_cflags)
                        ;;
                esac
                ;;
        (*)
-               cf_new_cflags="$cf_new_cflags $cf_add_cflags"
+               CF_APPEND_TEXT(cf_new_cflags,$cf_add_cflags)
                ;;
        esac
        ;;
 (yes)
-       cf_new_extra_cppflags="$cf_new_extra_cppflags $cf_add_cflags"
+       CF_APPEND_TEXT(cf_new_extra_cppflags,$cf_add_cflags)
 
-       cf_tst_cflags=`echo ${cf_add_cflags} |sed -e 's/^[[^"]]*"'\''//'`
+       cf_tst_cflags=`echo "${cf_add_cflags}" |sed -e 's/^[[^"]]*"'\''//'`
 
        test "x${cf_add_cflags}" != "x${cf_tst_cflags}" \
                && test -z "${cf_tst_cflags}" \
@@ -168,26 +172,26 @@ done
 
 if test -n "$cf_new_cflags" ; then
        ifelse([$2],,,[CF_VERBOSE(add to \$CFLAGS $cf_new_cflags)])
-       CFLAGS="$CFLAGS $cf_new_cflags"
+       CF_APPEND_TEXT(CFLAGS,$cf_new_cflags)
 fi
 
 if test -n "$cf_new_cppflags" ; then
        ifelse([$2],,,[CF_VERBOSE(add to \$CPPFLAGS $cf_new_cppflags)])
-       CPPFLAGS="$CPPFLAGS $cf_new_cppflags"
+       CF_APPEND_TEXT(CPPFLAGS,$cf_new_cppflags)
 fi
 
 if test -n "$cf_new_extra_cppflags" ; then
        ifelse([$2],,,[CF_VERBOSE(add to \$EXTRA_CPPFLAGS $cf_new_extra_cppflags)])
-       EXTRA_CPPFLAGS="$cf_new_extra_cppflags $EXTRA_CPPFLAGS"
+       CF_APPEND_TEXT(EXTRA_CPPFLAGS,$cf_new_extra_cppflags)
 fi
 
 AC_SUBST(EXTRA_CPPFLAGS)
 
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_ADD_INCDIR version: 14 updated: 2015/05/25 20:53:04
+dnl CF_ADD_INCDIR version: 17 updated: 2021/09/04 06:35:04
 dnl -------------
-dnl Add an include-directory to $CPPFLAGS.  Don't add /usr/include, since it's
+dnl Add an include-directory to $CPPFLAGS.  Don't add /usr/include, since it is
 dnl redundant.  We don't normally need to add -I/usr/local/include for gcc,
 dnl but old versions (and some misinstalled ones) need that.  To make things
 dnl worse, gcc 3.x may give error messages if -I/usr/local/include is added to
@@ -197,9 +201,9 @@ AC_DEFUN([CF_ADD_INCDIR],
 if test -n "$1" ; then
   for cf_add_incdir in $1
   do
-       while test $cf_add_incdir != /usr/include
+       while test "$cf_add_incdir" != /usr/include
        do
-         if test -d $cf_add_incdir
+         if test -d "$cf_add_incdir"
          then
                cf_have_incdir=no
                if test -n "$CFLAGS$CPPFLAGS" ; then
@@ -216,7 +220,7 @@ if test -n "$1" ; then
                        if test "$GCC" = yes
                        then
                          cf_save_CPPFLAGS=$CPPFLAGS
-                         CPPFLAGS="$CPPFLAGS -I$cf_add_incdir"
+                         CF_APPEND_TEXT(CPPFLAGS,-I$cf_add_incdir)
                          AC_TRY_COMPILE([#include <stdio.h>],
                                  [printf("Hello")],
                                  [],
@@ -230,7 +234,7 @@ if test -n "$1" ; then
                  CF_VERBOSE(adding $cf_add_incdir to include-path)
                  ifelse([$2],,CPPFLAGS,[$2])="$ifelse([$2],,CPPFLAGS,[$2]) -I$cf_add_incdir"
 
-                 cf_top_incdir=`echo $cf_add_incdir | sed -e 's%/include/.*$%/include%'`
+                 cf_top_incdir=`echo "$cf_add_incdir" | sed -e 's%/include/.*$%/include%'`
                  test "$cf_top_incdir" = "$cf_add_incdir" && break
                  cf_add_incdir="$cf_top_incdir"
                else
@@ -252,7 +256,7 @@ dnl $1 = library to add, without the "-l"
 dnl $2 = variable to update (default $LIBS)
 AC_DEFUN([CF_ADD_LIB],[CF_ADD_LIBS(-l$1,ifelse($2,,LIBS,[$2]))])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_ADD_LIBDIR version: 10 updated: 2015/04/18 08:56:57
+dnl CF_ADD_LIBDIR version: 11 updated: 2020/12/31 20:19:42
 dnl -------------
 dnl    Adds to the library-path
 dnl
@@ -266,9 +270,9 @@ AC_DEFUN([CF_ADD_LIBDIR],
 if test -n "$1" ; then
        for cf_add_libdir in $1
        do
-               if test $cf_add_libdir = /usr/lib ; then
+               if test "$cf_add_libdir" = /usr/lib ; then
                        :
-               elif test -d $cf_add_libdir
+               elif test -d "$cf_add_libdir"
                then
                        cf_have_libdir=no
                        if test -n "$LDFLAGS$LIBS" ; then
@@ -288,7 +292,7 @@ if test -n "$1" ; then
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_ADD_LIBS version: 2 updated: 2014/07/13 14:33:27
+dnl CF_ADD_LIBS version: 3 updated: 2019/11/02 16:47:33
 dnl -----------
 dnl Add one or more libraries, used to enforce consistency.  Libraries are
 dnl prepended to an existing list, since their dependencies are assumed to
@@ -297,24 +301,24 @@ dnl
 dnl $1 = libraries to add, with the "-l", etc.
 dnl $2 = variable to update (default $LIBS)
 AC_DEFUN([CF_ADD_LIBS],[
-cf_add_libs="$1"
-# Filter out duplicates - this happens with badly-designed ".pc" files...
-for cf_add_1lib in [$]ifelse($2,,LIBS,[$2])
-do
-       for cf_add_2lib in $cf_add_libs
-       do
-               if test "x$cf_add_1lib" = "x$cf_add_2lib"
-               then
+cf_add_libs="[$]ifelse($2,,LIBS,[$2])"
+# reverse order
+cf_add_0lib=
+for cf_add_1lib in $1; do cf_add_0lib="$cf_add_1lib $cf_add_0lib"; done
+# filter duplicates
+for cf_add_1lib in $cf_add_0lib; do
+       for cf_add_2lib in $cf_add_libs; do
+               if test "x$cf_add_1lib" = "x$cf_add_2lib"; then
                        cf_add_1lib=
                        break
                fi
        done
-       test -n "$cf_add_1lib" && cf_add_libs="$cf_add_libs $cf_add_1lib"
+       test -n "$cf_add_1lib" && cf_add_libs="$cf_add_1lib $cf_add_libs"
 done
 ifelse($2,,LIBS,[$2])="$cf_add_libs"
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_ADD_SUBDIR_PATH version: 4 updated: 2013/10/08 17:47:05
+dnl CF_ADD_SUBDIR_PATH version: 5 updated: 2020/12/31 20:19:42
 dnl ------------------
 dnl Append to a search-list for a nonstandard header/lib-file
 dnl    $1 = the variable to return as result
@@ -326,22 +330,57 @@ AC_DEFUN([CF_ADD_SUBDIR_PATH],
 [
 test "x$4" != "x$5" && \
 test -d "$4" && \
-ifelse([$5],NONE,,[(test -z "$5" || test x$5 = xNONE || test "x$4" != "x$5") &&]) {
+ifelse([$5],NONE,,[{ test -z "$5" || test "x$5" = xNONE || test "x$4" != "x$5"; } &&]) {
        test -n "$verbose" && echo "    ... testing for $3-directories under $4"
-       test -d $4/$3 &&          $1="[$]$1 $4/$3"
-       test -d $4/$3/$2 &&       $1="[$]$1 $4/$3/$2"
-       test -d $4/$3/$2/$3 &&    $1="[$]$1 $4/$3/$2/$3"
-       test -d $4/$2/$3 &&       $1="[$]$1 $4/$2/$3"
-       test -d $4/$2/$3/$2 &&    $1="[$]$1 $4/$2/$3/$2"
+       test -d "$4/$3" &&          $1="[$]$1 $4/$3"
+       test -d "$4/$3/$2" &&       $1="[$]$1 $4/$3/$2"
+       test -d "$4/$3/$2/$3" &&    $1="[$]$1 $4/$3/$2/$3"
+       test -d "$4/$2/$3" &&       $1="[$]$1 $4/$2/$3"
+       test -d "$4/$2/$3/$2" &&    $1="[$]$1 $4/$2/$3/$2"
 }
 ])dnl
 dnl ---------------------------------------------------------------------------
+dnl CF_APPEND_CFLAGS version: 3 updated: 2021/09/05 17:25:40
+dnl ----------------
+dnl Use CF_ADD_CFLAGS after first checking for potential redefinitions.
+dnl $1 = flags to add
+dnl $2 = if given makes this macro verbose.
+define([CF_APPEND_CFLAGS],
+[
+for cf_add_cflags in $1
+do
+       case "x$cf_add_cflags" in
+       (x-[[DU]]*)
+               CF_REMOVE_CFLAGS($cf_add_cflags,CFLAGS,[$2])
+               CF_REMOVE_CFLAGS($cf_add_cflags,CPPFLAGS,[$2])
+               ;;
+       esac
+       CF_ADD_CFLAGS([$cf_add_cflags],[$2])
+done
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_APPEND_TEXT version: 1 updated: 2017/02/25 18:58:55
+dnl --------------
+dnl use this macro for appending text without introducing an extra blank at
+dnl the beginning
+define([CF_APPEND_TEXT],
+[
+       test -n "[$]$1" && $1="[$]$1 "
+       $1="[$]{$1}$2"
+])dnl
+dnl ---------------------------------------------------------------------------
 dnl CF_ARG_DISABLE version: 3 updated: 1999/03/30 17:24:31
 dnl --------------
 dnl Allow user to disable a normally-on option.
 AC_DEFUN([CF_ARG_DISABLE],
 [CF_ARG_OPTION($1,[$2],[$3],[$4],yes)])dnl
 dnl ---------------------------------------------------------------------------
+dnl CF_ARG_ENABLE version: 3 updated: 1999/03/30 17:24:31
+dnl -------------
+dnl Allow user to enable a normally-off option.
+AC_DEFUN([CF_ARG_ENABLE],
+[CF_ARG_OPTION($1,[$2],[$3],[$4],no)])dnl
+dnl ---------------------------------------------------------------------------
 dnl CF_ARG_OPTION version: 5 updated: 2015/05/10 19:52:14
 dnl -------------
 dnl Restricted form of AC_ARG_ENABLE that ensures user doesn't give bogus
@@ -365,7 +404,7 @@ ifelse([$3],,[    :]dnl
 ])dnl
 ])])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_AR_FLAGS version: 6 updated: 2015/10/10 15:25:05
+dnl CF_AR_FLAGS version: 9 updated: 2021/01/01 13:31:04
 dnl -----------
 dnl Check for suitable "ar" (archiver) options for updating an archive.
 dnl
@@ -376,39 +415,55 @@ AC_DEFUN([CF_AR_FLAGS],[
 AC_REQUIRE([CF_PROG_AR])
 
 AC_CACHE_CHECK(for options to update archives, cf_cv_ar_flags,[
-       cf_cv_ar_flags=unknown
-       for cf_ar_flags in -curvU -curv curv -crv crv -cqv cqv -rv rv
-       do
+       case "$cf_cv_system_name" in
+       (*-msvc*)
+               cf_cv_ar_flags=''
+               cat >mk_static_lib.sh <<-EOF
+               #!$SHELL
+               MSVC_BIN="[$]AR"
+               out="\[$]1"
+               shift
+               exec \[$]MSVC_BIN -out:"\[$]out" \[$]@
+               EOF
+               chmod +x mk_static_lib.sh
+               AR=`pwd`/mk_static_lib.sh
+               ;;
+       (*)
+               cf_cv_ar_flags=unknown
+               for cf_ar_flags in -curvU -curv curv -crv crv -cqv cqv -rv rv
+               do
 
-               # check if $ARFLAGS already contains this choice
-               if test "x$ARFLAGS" != "x" ; then
-                       cf_check_ar_flags=`echo "x$ARFLAGS" | sed -e "s/$cf_ar_flags\$//" -e "s/$cf_ar_flags / /"`
-                       if test "x$ARFLAGS" != "$cf_check_ar_flags" ; then
-                               cf_cv_ar_flags=
-                               break
+                       # check if $ARFLAGS already contains this choice
+                       if test "x$ARFLAGS" != "x" ; then
+                               cf_check_ar_flags=`echo "x$ARFLAGS" | sed -e "s/$cf_ar_flags\$//" -e "s/$cf_ar_flags / /"`
+                               if test "x$ARFLAGS" != "$cf_check_ar_flags" ; then
+                                       cf_cv_ar_flags=
+                                       break
+                               fi
                        fi
-               fi
 
-               rm -f conftest.$ac_cv_objext
-               rm -f conftest.a
+                       rm -f "conftest.$ac_cv_objext"
+                       rm -f conftest.a
 
-               cat >conftest.$ac_ext <<EOF
+                       cat >"conftest.$ac_ext" <<EOF
 #line __oline__ "configure"
 int    testdata[[3]] = { 123, 456, 789 };
 EOF
-               if AC_TRY_EVAL(ac_compile) ; then
-                       echo "$AR $ARFLAGS $cf_ar_flags conftest.a conftest.$ac_cv_objext" >&AC_FD_CC
-                       $AR $ARFLAGS $cf_ar_flags conftest.a conftest.$ac_cv_objext 2>&AC_FD_CC 1>/dev/null
-                       if test -f conftest.a ; then
-                               cf_cv_ar_flags=$cf_ar_flags
+                       if AC_TRY_EVAL(ac_compile) ; then
+                               echo "$AR $ARFLAGS $cf_ar_flags conftest.a conftest.$ac_cv_objext" >&AC_FD_CC
+                               $AR $ARFLAGS "$cf_ar_flags" conftest.a "conftest.$ac_cv_objext" 2>&AC_FD_CC 1>/dev/null
+                               if test -f conftest.a ; then
+                                       cf_cv_ar_flags="$cf_ar_flags"
+                                       break
+                               fi
+                       else
+                               CF_VERBOSE(cannot compile test-program)
                                break
                        fi
-               else
-                       CF_VERBOSE(cannot compile test-program)
-                       break
-               fi
-       done
-       rm -f conftest.a conftest.$ac_ext conftest.$ac_cv_objext
+               done
+               rm -f conftest.a "conftest.$ac_ext" "conftest.$ac_cv_objext"
+               ;;
+       esac
 ])
 
 if test -n "$ARFLAGS" ; then
@@ -422,7 +477,7 @@ fi
 AC_SUBST(ARFLAGS)
 ])
 dnl ---------------------------------------------------------------------------
-dnl CF_BUILD_CC version: 7 updated: 2012/10/06 15:31:55
+dnl CF_BUILD_CC version: 9 updated: 2021/01/02 09:31:20
 dnl -----------
 dnl If we're cross-compiling, allow the user to override the tools and their
 dnl options.  The configure script is oriented toward identifying the host
@@ -447,7 +502,7 @@ if test "$cross_compiling" = yes ; then
        AC_ARG_WITH(build-cc,
                [  --with-build-cc=XXX     the build C compiler ($BUILD_CC)],
                [BUILD_CC="$withval"],
-               [AC_CHECK_PROGS(BUILD_CC, gcc cc cl)])
+               [AC_CHECK_PROGS(BUILD_CC, [gcc clang c99 c89 cc cl],none)])
        AC_MSG_CHECKING(for native build C compiler)
        AC_MSG_RESULT($BUILD_CC)
 
@@ -488,7 +543,7 @@ if test "$cross_compiling" = yes ; then
 
        : ${BUILD_CC:='${CC}'}
 
-       if ( test "$BUILD_CC" = "$CC" || test "$BUILD_CC" = '${CC}' ) ; then
+       if { test "$BUILD_CC" = "$CC" || test "$BUILD_CC" = '${CC}'; } ; then
                AC_MSG_ERROR([Cross-build requires two compilers.
 Use --with-build-cc to specify the native compiler.])
        fi
@@ -514,11 +569,50 @@ AC_SUBST(BUILD_EXEEXT)
 AC_SUBST(BUILD_OBJEXT)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_CC_ENV_FLAGS version: 4 updated: 2016/06/25 16:23:40
+dnl CF_C11_NORETURN version: 3 updated: 2021/03/28 11:36:23
+dnl ---------------
+AC_DEFUN([CF_C11_NORETURN],
+[
+AC_MSG_CHECKING(if you want to use C11 _Noreturn feature)
+CF_ARG_ENABLE(stdnoreturn,
+       [  --enable-stdnoreturn    enable C11 _Noreturn feature for diagnostics],
+       [enable_stdnoreturn=yes],
+       [enable_stdnoreturn=no])
+AC_MSG_RESULT($enable_stdnoreturn)
+
+if test $enable_stdnoreturn = yes; then
+AC_CACHE_CHECK([for C11 _Noreturn feature], cf_cv_c11_noreturn,
+       [AC_TRY_COMPILE([
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdnoreturn.h>
+static _Noreturn void giveup(void) { exit(0); }
+       ],
+       [if (feof(stdin)) giveup()],
+       cf_cv_c11_noreturn=yes,
+       cf_cv_c11_noreturn=no)
+       ])
+else
+       cf_cv_c11_noreturn=no,
+fi
+
+if test "$cf_cv_c11_noreturn" = yes; then
+       AC_DEFINE(HAVE_STDNORETURN_H, 1,[Define if <stdnoreturn.h> header is available and working])
+       AC_DEFINE_UNQUOTED(STDC_NORETURN,_Noreturn,[Define if C11 _Noreturn keyword is supported])
+       HAVE_STDNORETURN_H=1
+else
+       HAVE_STDNORETURN_H=0
+fi
+
+AC_SUBST(HAVE_STDNORETURN_H)
+AC_SUBST(STDC_NORETURN)
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_CC_ENV_FLAGS version: 10 updated: 2020/12/31 18:40:20
 dnl ---------------
 dnl Check for user's environment-breakage by stuffing CFLAGS/CPPFLAGS content
-dnl into CC.  This will not help with broken scripts that wrap the compiler with
-dnl options, but eliminates a more common category of user confusion.
+dnl into CC.  This will not help with broken scripts that wrap the compiler
+dnl with options, but eliminates a more common category of user confusion.
 dnl
 dnl In particular, it addresses the problem of being able to run the C
 dnl preprocessor in a consistent manner.
@@ -529,17 +623,45 @@ dnl outweighs that limitation.
 AC_DEFUN([CF_CC_ENV_FLAGS],
 [
 # This should have been defined by AC_PROG_CC
-: ${CC:=cc}
+: "${CC:=cc}"
+
+AC_MSG_CHECKING(\$CFLAGS variable)
+case "x$CFLAGS" in
+(*-[[IUD]]*)
+       AC_MSG_RESULT(broken)
+       AC_MSG_WARN(your environment uses the CFLAGS variable to hold CPPFLAGS options)
+       cf_flags="$CFLAGS"
+       CFLAGS=
+       for cf_arg in $cf_flags
+       do
+               CF_ADD_CFLAGS($cf_arg)
+       done
+       ;;
+(*)
+       AC_MSG_RESULT(ok)
+       ;;
+esac
 
 AC_MSG_CHECKING(\$CC variable)
 case "$CC" in
 (*[[\ \        ]]-*)
        AC_MSG_RESULT(broken)
-       AC_MSG_WARN(your environment misuses the CC variable to hold CFLAGS/CPPFLAGS options)
+       AC_MSG_WARN(your environment uses the CC variable to hold CFLAGS/CPPFLAGS options)
        # humor him...
-       cf_flags=`echo "$CC" | sed -e 's/^[[^   ]]*[[   ]][[    ]]*//'`
-       CC=`echo "$CC " | sed -e 's/[[  ]]-[[IUD]][[^   ]][[^   ]]*//g' -e 's/[[        ]]*$//'`
-       CF_ADD_CFLAGS($cf_flags)
+       cf_prog=`echo "$CC" | sed -e 's/        / /g' -e 's/[[ ]]* / /g' -e 's/[[ ]]*[[ ]]-[[^ ]].*//'`
+       cf_flags=`echo "$CC" | ${AWK:-awk} -v prog="$cf_prog" '{ printf("%s", [substr]([$]0,1+length(prog))); }'`
+       CC="$cf_prog"
+       for cf_arg in $cf_flags
+       do
+               case "x$cf_arg" in
+               (x-[[IUDfgOW]]*)
+                       CF_ADD_CFLAGS($cf_arg)
+                       ;;
+               (*)
+                       CC="$CC $cf_arg"
+                       ;;
+               esac
+       done
        CF_VERBOSE(resulting CC: '$CC')
        CF_VERBOSE(resulting CFLAGS: '$CFLAGS')
        CF_VERBOSE(resulting CPPFLAGS: '$CPPFLAGS')
@@ -550,7 +672,7 @@ case "$CC" in
 esac
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_CFG_DEFAULTS version: 11 updated: 2015/04/17 21:13:04
+dnl CF_CFG_DEFAULTS version: 16 updated: 2021/01/04 19:33:05
 dnl ---------------
 dnl Determine the default configuration into which we'll install ncurses.  This
 dnl can be overridden by the user's command-line options.  There's two items to
@@ -563,7 +685,8 @@ dnl We don't use AC_PREFIX_DEFAULT, because it gets evaluated too soon, and
 dnl we don't use AC_PREFIX_PROGRAM, because we cannot distinguish ncurses's
 dnl programs from a vendor's.
 AC_DEFUN([CF_CFG_DEFAULTS],
-[
+[AC_REQUIRE([AC_PROG_FGREP])dnl
+
 AC_MSG_CHECKING(for prefix)
 if test "x$prefix" = "xNONE" ; then
        case "$cf_cv_system_name" in
@@ -581,20 +704,20 @@ if test "x$prefix" = "xNONE" ; then
 AC_MSG_CHECKING(for default include-directory)
 test -n "$verbose" && echo 1>&AC_FD_MSG
 for cf_symbol in \
-       $includedir \
-       $includedir/ncurses \
-       $prefix/include \
-       $prefix/include/ncurses \
+       "$includedir" \
+       "$includedir/ncurses" \
+       "$prefix/include" \
+       "$prefix/include/ncurses" \
        /usr/local/include \
        /usr/local/include/ncurses \
        /usr/include \
        /usr/include/ncurses
 do
-       cf_dir=`eval echo $cf_symbol`
-       if test -f $cf_dir/curses.h ; then
-       if ( fgrep NCURSES_VERSION $cf_dir/curses.h 2>&1 >/dev/null ) ; then
+       cf_dir=`eval echo "$cf_symbol"`
+       if test -f "$cf_dir/curses.h" ; then
+       if ( ${FGREP-fgrep} NCURSES_VERSION "$cf_dir/curses.h" >/dev/null 2>&1 ) ; then
                includedir="$cf_symbol"
-               test -n "$verbose"  && echo $ac_n "     found " 1>&AC_FD_MSG
+               test -n "$verbose"  && echo $ECHO_N "   found " 1>&AC_FD_MSG
                break
        fi
        fi
@@ -604,7 +727,7 @@ AC_MSG_RESULT($includedir)
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_CHECK_CACHE version: 12 updated: 2012/10/02 20:55:03
+dnl CF_CHECK_CACHE version: 13 updated: 2020/12/31 10:54:15
 dnl --------------
 dnl Check if we're accidentally using a cache from a different machine.
 dnl Derive the system name, as a check for reusing the autoconf cache.
@@ -618,7 +741,7 @@ dnl Note: we would use $ac_config_sub, but that is one of the places where
 dnl autoconf 2.5x broke compatibility with autoconf 2.13
 AC_DEFUN([CF_CHECK_CACHE],
 [
-if test -f $srcdir/config.guess || test -f $ac_aux_dir/config.guess ; then
+if test -f "$srcdir/config.guess" || test -f "$ac_aux_dir/config.guess" ; then
        ifelse([$1],,[AC_CANONICAL_HOST],[$1])
        system_name="$host_os"
 else
@@ -639,7 +762,54 @@ if test ".$system_name" != ".$cf_cv_system_name" ; then
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_CLANG_COMPILER version: 2 updated: 2013/11/19 19:23:35
+dnl CF_CHECK_GNAT_VERSION version: 4 updated: 2021/01/01 13:31:04
+dnl ---------------------
+AC_DEFUN([CF_CHECK_GNAT_VERSION],
+[
+AC_REQUIRE([CF_GNAT_VERSION])
+case "$cf_cv_gnat_version" in
+(3.1[[1-9]]*|3.[[2-9]]*|[[4-9]].*|[[1-9]][[0-9]].[[0-9]]*|20[[0-9]][[0-9]])
+       cf_cv_prog_gnat_correct=yes
+       ;;
+(*)
+       AC_MSG_WARN(Unsupported GNAT version $cf_cv_gnat_version. We require 3.11 or better. Disabling Ada95 binding.)
+       cf_cv_prog_gnat_correct=no
+       ;;
+esac
+])
+dnl ---------------------------------------------------------------------------
+dnl CF_CHECK_LIBSSP version: 1 updated: 2021/10/30 10:40:19
+dnl ---------------
+dnl Check if libssp is needed, e.g., to work around misconfigured libraries
+dnl used in cross-compiling to MinGW.
+AC_DEFUN([CF_CHECK_LIBSSP],[
+AC_CACHE_CHECK(if ssp library is needed,cf_cv_need_libssp,[
+AC_TRY_LINK([
+#include <sys/types.h>
+#include <dirent.h>
+],[
+       DIR *dp = opendir(".");
+],cf_cv_need_libssp=no,[
+       cf_save_LIBS="$LIBS"
+       LIBS="$LIBS -lssp"
+       AC_TRY_LINK([
+#include <sys/types.h>
+#include <dirent.h>
+       ],[
+                  DIR *dp = opendir(".");
+       ],cf_cv_need_libssp=yes,
+         cf_cv_need_libssp=maybe)
+       LIBS="$cf_save_LIBS"
+])dnl
+])
+
+if test "x$cf_cv_need_libssp" = xyes
+then
+       CF_ADD_LIB(ssp)
+fi
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_CLANG_COMPILER version: 8 updated: 2021/01/01 13:31:04
 dnl -----------------
 dnl Check if the given compiler is really clang.  clang's C driver defines
 dnl __GNUC__ (fooling the configure script into setting $GCC to yes) but does
@@ -658,20 +828,175 @@ ifelse([$2],,CLANG_COMPILER,[$2])=no
 if test "$ifelse([$1],,[$1],GCC)" = yes ; then
        AC_MSG_CHECKING(if this is really Clang ifelse([$1],GXX,C++,C) compiler)
        cf_save_CFLAGS="$ifelse([$3],,CFLAGS,[$3])"
-       ifelse([$3],,CFLAGS,[$3])="$ifelse([$3],,CFLAGS,[$3]) -Qunused-arguments"
        AC_TRY_COMPILE([],[
 #ifdef __clang__
 #else
 make an error
 #endif
 ],[ifelse([$2],,CLANG_COMPILER,[$2])=yes
-cf_save_CFLAGS="$cf_save_CFLAGS -Qunused-arguments"
 ],[])
        ifelse([$3],,CFLAGS,[$3])="$cf_save_CFLAGS"
        AC_MSG_RESULT($ifelse([$2],,CLANG_COMPILER,[$2]))
 fi
+
+CLANG_VERSION=none
+
+if test "x$ifelse([$2],,CLANG_COMPILER,[$2])" = "xyes" ; then
+       case "$CC" in
+       (c[[1-9]][[0-9]]|*/c[[1-9]][[0-9]])
+               AC_MSG_WARN(replacing broken compiler alias $CC)
+               CFLAGS="$CFLAGS -std=`echo "$CC" | sed -e 's%.*/%%'`"
+               CC=clang
+               ;;
+       esac
+
+       AC_MSG_CHECKING(version of $CC)
+       CLANG_VERSION="`$CC --version 2>/dev/null | sed -e '2,$d' -e 's/^.*(CLANG[[^)]]*) //' -e 's/^.*(Debian[[^)]]*) //' -e 's/^[[^0-9.]]*//' -e 's/[[^0-9.]].*//'`"
+       test -z "$CLANG_VERSION" && CLANG_VERSION=unknown
+       AC_MSG_RESULT($CLANG_VERSION)
+
+       for cf_clang_opt in \
+               -Qunused-arguments \
+               -Wno-error=implicit-function-declaration
+       do
+               AC_MSG_CHECKING(if option $cf_clang_opt works)
+               cf_save_CFLAGS="$CFLAGS"
+               CFLAGS="$CFLAGS $cf_clang_opt"
+               AC_TRY_LINK([
+                       #include <stdio.h>],[
+                       printf("hello!\\n");],[
+                       cf_clang_optok=yes],[
+                       cf_clang_optok=no])
+               AC_MSG_RESULT($cf_clang_optok)
+               CFLAGS="$cf_save_CFLAGS"
+               if test "$cf_clang_optok" = yes; then
+                       CF_VERBOSE(adding option $cf_clang_opt)
+                       CF_APPEND_TEXT(CFLAGS,$cf_clang_opt)
+               fi
+       done
+fi
 ])
 dnl ---------------------------------------------------------------------------
+dnl CF_CONST_X_STRING version: 7 updated: 2021/06/07 17:39:17
+dnl -----------------
+dnl The X11R4-X11R6 Xt specification uses an ambiguous String type for most
+dnl character-strings.
+dnl
+dnl It is ambiguous because the specification accommodated the pre-ANSI
+dnl compilers bundled by more than one vendor in lieu of providing a standard C
+dnl compiler other than by costly add-ons.  Because of this, the specification
+dnl did not take into account the use of const for telling the compiler that
+dnl string literals would be in readonly memory.
+dnl
+dnl As a workaround, one could (starting with X11R5) define XTSTRINGDEFINES, to
+dnl let the compiler decide how to represent Xt's strings which were #define'd.
+dnl That does not solve the problem of using the block of Xt's strings which
+dnl are compiled into the library (and is less efficient than one might want).
+dnl
+dnl Xt specification 7 introduces the _CONST_X_STRING symbol which is used both
+dnl when compiling the library and compiling using the library, to tell the
+dnl compiler that String is const.
+AC_DEFUN([CF_CONST_X_STRING],
+[
+AC_REQUIRE([AC_PATH_XTRA])
+
+CF_SAVE_XTRA_FLAGS([CF_CONST_X_STRING])
+
+AC_TRY_COMPILE(
+[
+#include <stdlib.h>
+#include <X11/Intrinsic.h>
+],
+[String foo = malloc(1); free((void*)foo)],[
+
+AC_CACHE_CHECK(for X11/Xt const-feature,cf_cv_const_x_string,[
+       AC_TRY_COMPILE(
+               [
+#define _CONST_X_STRING        /* X11R7.8 (perhaps) */
+#undef  XTSTRINGDEFINES        /* X11R5 and later */
+#include <stdlib.h>
+#include <X11/Intrinsic.h>
+               ],[String foo = malloc(1); *foo = 0],[
+                       cf_cv_const_x_string=no
+               ],[
+                       cf_cv_const_x_string=yes
+               ])
+])
+
+CF_RESTORE_XTRA_FLAGS([CF_CONST_X_STRING])
+
+case "$cf_cv_const_x_string" in
+(no)
+       CF_APPEND_TEXT(CPPFLAGS,-DXTSTRINGDEFINES)
+       ;;
+(*)
+       CF_APPEND_TEXT(CPPFLAGS,-D_CONST_X_STRING)
+       ;;
+esac
+
+])
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_CONST_X_STRING version: 7 updated: 2021/06/07 17:39:17
+dnl -----------------
+dnl The X11R4-X11R6 Xt specification uses an ambiguous String type for most
+dnl character-strings.
+dnl
+dnl It is ambiguous because the specification accommodated the pre-ANSI
+dnl compilers bundled by more than one vendor in lieu of providing a standard C
+dnl compiler other than by costly add-ons.  Because of this, the specification
+dnl did not take into account the use of const for telling the compiler that
+dnl string literals would be in readonly memory.
+dnl
+dnl As a workaround, one could (starting with X11R5) define XTSTRINGDEFINES, to
+dnl let the compiler decide how to represent Xt's strings which were #define'd.
+dnl That does not solve the problem of using the block of Xt's strings which
+dnl are compiled into the library (and is less efficient than one might want).
+dnl
+dnl Xt specification 7 introduces the _CONST_X_STRING symbol which is used both
+dnl when compiling the library and compiling using the library, to tell the
+dnl compiler that String is const.
+AC_DEFUN([CF_CONST_X_STRING],
+[
+AC_REQUIRE([AC_PATH_XTRA])
+
+CF_SAVE_XTRA_FLAGS([CF_CONST_X_STRING])
+
+AC_TRY_COMPILE(
+[
+#include <stdlib.h>
+#include <X11/Intrinsic.h>
+],
+[String foo = malloc(1); free((void*)foo)],[
+
+AC_CACHE_CHECK(for X11/Xt const-feature,cf_cv_const_x_string,[
+       AC_TRY_COMPILE(
+               [
+#define _CONST_X_STRING        /* X11R7.8 (perhaps) */
+#undef  XTSTRINGDEFINES        /* X11R5 and later */
+#include <stdlib.h>
+#include <X11/Intrinsic.h>
+               ],[String foo = malloc(1); *foo = 0],[
+                       cf_cv_const_x_string=no
+               ],[
+                       cf_cv_const_x_string=yes
+               ])
+])
+
+CF_RESTORE_XTRA_FLAGS([CF_CONST_X_STRING])
+
+case "$cf_cv_const_x_string" in
+(no)
+       CF_APPEND_TEXT(CPPFLAGS,-DXTSTRINGDEFINES)
+       ;;
+(*)
+       CF_APPEND_TEXT(CPPFLAGS,-D_CONST_X_STRING)
+       ;;
+esac
+
+])
+])dnl
+dnl ---------------------------------------------------------------------------
 dnl CF_CURSES_HEADER version: 5 updated: 2015/04/23 20:35:30
 dnl ----------------
 dnl Find a "curses" header file, e.g,. "curses.h", or one of the more common
@@ -699,14 +1024,14 @@ fi
 AC_CHECK_HEADERS($cf_cv_ncurses_header)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_DIRNAME version: 4 updated: 2002/12/21 19:25:52
+dnl CF_DIRNAME version: 5 updated: 2020/12/31 20:19:42
 dnl ----------
 dnl "dirname" is not portable, so we fake it with a shell script.
-AC_DEFUN([CF_DIRNAME],[$1=`echo $2 | sed -e 's%/[[^/]]*$%%'`])dnl
+AC_DEFUN([CF_DIRNAME],[$1=`echo "$2" | sed -e 's%/[[^/]]*$%%'`])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_DISABLE_ECHO version: 13 updated: 2015/04/18 08:56:57
+dnl CF_DISABLE_ECHO version: 14 updated: 2021/09/04 06:35:04
 dnl ---------------
-dnl You can always use "make -n" to see the actual options, but it's hard to
+dnl You can always use "make -n" to see the actual options, but it is hard to
 dnl pick out/analyze warning messages when the compile-line is long.
 dnl
 dnl Sets:
@@ -752,7 +1077,59 @@ CF_ARG_DISABLE(gnat-projects,
 AC_MSG_RESULT($enable_gnat_projects)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_FIND_LIBRARY version: 9 updated: 2008/03/23 14:48:54
+dnl CF_ENABLE_BROKEN_LINKER version: 2 updated: 2021/01/02 17:09:14
+dnl -----------------------
+dnl Some linkers cannot reference a data-only object.  Cygwin used to be one.
+dnl This usually follows CF_LINK_DATAONLY, but is not required in case we need
+dnl an unconditional feature.
+AC_DEFUN([CF_ENABLE_BROKEN_LINKER],[
+
+AC_MSG_CHECKING(if you want broken-linker support code)
+AC_ARG_ENABLE(broken_linker,
+       [  --enable-broken_linker  compile with broken-linker support code],
+       [with_broken_linker=$enableval],
+       [with_broken_linker=no])
+AC_MSG_RESULT($with_broken_linker)
+
+: "${BROKEN_LINKER:=0}"
+if test "x$with_broken_linker" = xyes ; then
+       AC_DEFINE(BROKEN_LINKER,1,[Define to 1 to work around linkers which cannot link data-only modules])
+       BROKEN_LINKER=1
+fi
+AC_SUBST(BROKEN_LINKER)
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_ENABLE_WARNINGS version: 9 updated: 2021/01/05 19:40:50
+dnl ------------------
+dnl Configure-option to enable gcc warnings
+dnl
+dnl $1 = extra options to add, if supported
+dnl $2 = option for checking attributes.  By default, this is done when
+dnl      warnings are enabled.  For other values:
+dnl      yes: always do this, e.g., to use in generated library-headers
+dnl      no: never do this
+AC_DEFUN([CF_ENABLE_WARNINGS],[
+if test "$GCC" = yes || test "$GXX" = yes
+then
+CF_FIX_WARNINGS(CFLAGS)
+CF_FIX_WARNINGS(CPPFLAGS)
+CF_FIX_WARNINGS(LDFLAGS)
+AC_MSG_CHECKING(if you want to turn on gcc warnings)
+CF_ARG_ENABLE(warnings,
+       [  --enable-warnings       test: turn on gcc compiler warnings],
+       [enable_warnings=yes],
+       [enable_warnings=no])
+AC_MSG_RESULT($enable_warnings)
+if test "$enable_warnings" = "yes"
+then
+       ifelse($2,,[CF_GCC_ATTRIBUTES])
+       CF_GCC_WARNINGS($1)
+fi
+ifelse($2,yes,[CF_GCC_ATTRIBUTES])
+fi
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_FIND_LIBRARY version: 11 updated: 2021/01/02 09:31:20
 dnl ---------------
 dnl Look for a non-standard library, given parameters for AC_TRY_LINK.  We
 dnl prefer a standard location, and use -L options only if we do not find the
@@ -768,16 +1145,16 @@ dnl Sets the variable "$cf_libdir" as a side-effect, so we can see if we had
 dnl to use a -L option.
 AC_DEFUN([CF_FIND_LIBRARY],
 [
-       eval 'cf_cv_have_lib_'$1'=no'
+       eval 'cf_cv_have_lib_'"$1"'=no'
        cf_libdir=""
        AC_CHECK_FUNC($5,
-               eval 'cf_cv_have_lib_'$1'=yes',[
+               eval 'cf_cv_have_lib_'"$1"'=yes',[
                cf_save_LIBS="$LIBS"
                AC_MSG_CHECKING(for $5 in -l$1)
                LIBS="-l$1 $LIBS"
                AC_TRY_LINK([$3],[$4],
                        [AC_MSG_RESULT(yes)
-                        eval 'cf_cv_have_lib_'$1'=yes'
+                        eval 'cf_cv_have_lib_'"$1"'=yes'
                        ],
                        [AC_MSG_RESULT(no)
                        CF_LIBRARY_PATH(cf_search,$2)
@@ -787,22 +1164,22 @@ AC_DEFUN([CF_FIND_LIBRARY],
                                LIBS="-L$cf_libdir -l$1 $cf_save_LIBS"
                                AC_TRY_LINK([$3],[$4],
                                        [AC_MSG_RESULT(yes)
-                                        eval 'cf_cv_have_lib_'$1'=yes'
+                                        eval 'cf_cv_have_lib_'"$1"'=yes'
                                         break],
                                        [AC_MSG_RESULT(no)
                                         LIBS="$cf_save_LIBS"])
                        done
                        ])
                ])
-eval 'cf_found_library=[$]cf_cv_have_lib_'$1
+eval 'cf_found_library="[$]cf_cv_have_lib_'"$1"\"
 ifelse($6,,[
-if test $cf_found_library = no ; then
+if test "$cf_found_library" = no ; then
        AC_MSG_ERROR(Cannot link $1 library)
 fi
 ])
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_FIND_LINKAGE version: 20 updated: 2015/04/18 08:56:57
+dnl CF_FIND_LINKAGE version: 22 updated: 2020/12/31 20:19:42
 dnl ---------------
 dnl Find a library (specifically the linkage used in the code fragment),
 dnl searching for it if it is not already in the library path.
@@ -859,9 +1236,10 @@ AC_TRY_LINK([$1],[$2],[
        CF_HEADER_PATH(cf_search,ifelse([$6],,[$3],[$6]))
        for cf_cv_header_path_$3 in $cf_search
        do
-               if test -d $cf_cv_header_path_$3 ; then
+               if test -d "$cf_cv_header_path_$3" ; then
                        CF_VERBOSE(... testing $cf_cv_header_path_$3)
-                       CPPFLAGS="$cf_save_CPPFLAGS -I$cf_cv_header_path_$3"
+                       CPPFLAGS="$cf_save_CPPFLAGS"
+                       CF_APPEND_TEXT(CPPFLAGS,-I$cf_cv_header_path_$3)
                        AC_TRY_COMPILE([$1],[$2],[
                                CF_VERBOSE(... found $3 headers in $cf_cv_header_path_$3)
                                cf_cv_find_linkage_$3=maybe
@@ -893,7 +1271,7 @@ AC_TRY_LINK([$1],[$2],[
                        CF_LIBRARY_PATH(cf_search,$3)
                        for cf_cv_library_path_$3 in $cf_search
                        do
-                               if test -d $cf_cv_library_path_$3 ; then
+                               if test -d "$cf_cv_library_path_$3" ; then
                                        CF_VERBOSE(... testing $cf_cv_library_path_$3)
                                        CPPFLAGS="$cf_test_CPPFLAGS"
                                        LIBS="-l$3 $7 $cf_save_LIBS"
@@ -951,14 +1329,50 @@ AC_DEFUN([CF_FIXUP_ADAFLAGS],[
        AC_MSG_RESULT($ADAFLAGS)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_GCC_ATTRIBUTES version: 17 updated: 2015/04/12 15:39:00
+dnl CF_FIX_WARNINGS version: 3 updated: 2020/12/31 18:40:20
+dnl ---------------
+dnl Warning flags do not belong in CFLAGS, CPPFLAGS, etc.  Any of gcc's
+dnl "-Werror" flags can interfere with configure-checks.  Those go into
+dnl EXTRA_CFLAGS.
+dnl
+dnl $1 = variable name to repair
+define([CF_FIX_WARNINGS],[
+if test "$GCC" = yes || test "$GXX" = yes
+then
+       case [$]$1 in
+       (*-Werror=*)
+               CF_VERBOSE(repairing $1: [$]$1)
+               cf_temp_flags=
+               for cf_temp_scan in [$]$1
+               do
+                       case "x$cf_temp_scan" in
+                       (x-Werror=*)
+                               CF_APPEND_TEXT(EXTRA_CFLAGS,$cf_temp_scan)
+                               ;;
+                       (*)
+                               CF_APPEND_TEXT(cf_temp_flags,$cf_temp_scan)
+                               ;;
+                       esac
+               done
+               $1="$cf_temp_flags"
+               CF_VERBOSE(... fixed [$]$1)
+               CF_VERBOSE(... extra $EXTRA_CFLAGS)
+               ;;
+       esac
+fi
+AC_SUBST(EXTRA_CFLAGS)
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_GCC_ATTRIBUTES version: 24 updated: 2021/03/20 12:00:25
 dnl -----------------
 dnl Test for availability of useful gcc __attribute__ directives to quiet
 dnl compiler warnings.  Though useful, not all are supported -- and contrary
 dnl to documentation, unrecognized directives cause older compilers to barf.
 AC_DEFUN([CF_GCC_ATTRIBUTES],
-[
-if test "$GCC" = yes
+[AC_REQUIRE([AC_PROG_FGREP])dnl
+AC_REQUIRE([CF_C11_NORETURN])dnl
+
+if test "$GCC" = yes || test "$GXX" = yes
 then
 cat > conftest.i <<EOF
 #ifndef GCC_PRINTF
@@ -977,7 +1391,7 @@ EOF
 if test "$GCC" = yes
 then
        AC_CHECKING([for $CC __attribute__ directives])
-cat > conftest.$ac_ext <<EOF
+cat > "conftest.$ac_ext" <<EOF
 #line __oline__ "${as_me:-configure}"
 #include "confdefs.h"
 #include "conftest.h"
@@ -993,9 +1407,9 @@ cat > conftest.$ac_ext <<EOF
 #define GCC_SCANFLIKE(fmt,var)  /*nothing*/
 #endif
 extern void wow(char *,...) GCC_SCANFLIKE(1,2);
-extern void oops(char *,...) GCC_PRINTFLIKE(1,2) GCC_NORETURN;
-extern void foo(void) GCC_NORETURN;
-int main(int argc GCC_UNUSED, char *argv[[]] GCC_UNUSED) { return 0; }
+extern GCC_NORETURN void oops(char *,...) GCC_PRINTFLIKE(1,2);
+extern GCC_NORETURN void foo(void);
+int main(int argc GCC_UNUSED, char *argv[[]] GCC_UNUSED) { (void)argc; (void)argv; return 0; }
 EOF
        cf_printf_attribute=no
        cf_scanf_attribute=no
@@ -1005,7 +1419,7 @@ EOF
                cf_directive="__attribute__(($cf_attribute))"
                echo "checking for $CC $cf_directive" 1>&AC_FD_CC
 
-               case $cf_attribute in
+               case "$cf_attribute" in
                (printf)
                        cf_printf_attribute=yes
                        cat >conftest.h <<EOF
@@ -1028,7 +1442,7 @@ EOF
                if AC_TRY_EVAL(ac_compile); then
                        test -n "$verbose" && AC_MSG_RESULT(... $cf_attribute)
                        cat conftest.h >>confdefs.h
-                       case $cf_attribute in
+                       case "$cf_attribute" in
                        (noreturn)
                                AC_DEFINE_UNQUOTED(GCC_NORETURN,$cf_directive,[Define to noreturn-attribute for gcc])
                                ;;
@@ -1055,15 +1469,16 @@ EOF
                fi
        done
 else
-       fgrep define conftest.i >>confdefs.h
+       ${FGREP-fgrep} define conftest.i >>confdefs.h
 fi
-rm -rf conftest*
+rm -rf ./conftest*
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_GCC_VERSION version: 7 updated: 2012/10/18 06:46:33
+dnl CF_GCC_VERSION version: 8 updated: 2019/09/07 13:38:36
 dnl --------------
-dnl Find version of gcc
+dnl Find version of gcc, and (because icc/clang pretend to be gcc without being
+dnl compatible), attempt to determine if icc/clang is actually used.
 AC_DEFUN([CF_GCC_VERSION],[
 AC_REQUIRE([AC_PROG_CC])
 GCC_VERSION=none
@@ -1073,14 +1488,17 @@ if test "$GCC" = yes ; then
        test -z "$GCC_VERSION" && GCC_VERSION=unknown
        AC_MSG_RESULT($GCC_VERSION)
 fi
+CF_INTEL_COMPILER(GCC,INTEL_COMPILER,CFLAGS)
+CF_CLANG_COMPILER(GCC,CLANG_COMPILER,CFLAGS)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_GCC_WARNINGS version: 32 updated: 2015/04/12 15:39:00
+dnl CF_GCC_WARNINGS version: 41 updated: 2021/01/01 16:53:59
 dnl ---------------
 dnl Check if the compiler supports useful warning options.  There's a few that
 dnl we don't use, simply because they're too noisy:
 dnl
 dnl    -Wconversion (useful in older versions of gcc, but not in gcc 2.7.x)
+dnl    -Winline (usually not worthwhile)
 dnl    -Wredundant-decls (system headers make this too noisy)
 dnl    -Wtraditional (combines too many unrelated messages, only a few useful)
 dnl    -Wwrite-strings (too noisy, but should review occasionally).  This
@@ -1097,14 +1515,11 @@ dnl
 AC_DEFUN([CF_GCC_WARNINGS],
 [
 AC_REQUIRE([CF_GCC_VERSION])
-CF_INTEL_COMPILER(GCC,INTEL_COMPILER,CFLAGS)
-CF_CLANG_COMPILER(GCC,CLANG_COMPILER,CFLAGS)
-
-cat > conftest.$ac_ext <<EOF
+if test "x$have_x" = xyes; then CF_CONST_X_STRING fi
+cat > "conftest.$ac_ext" <<EOF
 #line __oline__ "${as_me:-configure}"
 int main(int argc, char *argv[[]]) { return (argv[[argc-1]] == 0) ; }
 EOF
-
 if test "$INTEL_COMPILER" = yes
 then
 # The "-wdXXX" options suppress warnings:
@@ -1120,7 +1535,7 @@ then
 
        AC_CHECKING([for $CC warning options])
        cf_save_CFLAGS="$CFLAGS"
-       EXTRA_CFLAGS="-Wall"
+       EXTRA_CFLAGS="$EXTRA_CFLAGS -Wall"
        for cf_opt in \
                wd1419 \
                wd1683 \
@@ -1139,12 +1554,10 @@ then
                fi
        done
        CFLAGS="$cf_save_CFLAGS"
-
-elif test "$GCC" = yes
+elif test "$GCC" = yes && test "$GCC_VERSION" != "unknown"
 then
        AC_CHECKING([for $CC warning options])
        cf_save_CFLAGS="$CFLAGS"
-       EXTRA_CFLAGS=
        cf_warn_CONST=""
        test "$with_ext_const" = yes && cf_warn_CONST="Wwrite-strings"
        cf_gcc_warnings="Wignored-qualifiers Wlogical-op Wvarargs"
@@ -1162,24 +1575,21 @@ then
                Wpointer-arith \
                Wshadow \
                Wstrict-prototypes \
-               Wundef $cf_gcc_warnings $cf_warn_CONST $1
+               Wundef Wno-inline $cf_gcc_warnings $cf_warn_CONST $1
        do
                CFLAGS="$cf_save_CFLAGS $EXTRA_CFLAGS -$cf_opt"
                if AC_TRY_EVAL(ac_compile); then
                        test -n "$verbose" && AC_MSG_RESULT(... -$cf_opt)
-                       case $cf_opt in
-                       (Wcast-qual)
-                               CPPFLAGS="$CPPFLAGS -DXTSTRINGDEFINES"
-                               ;;
+                       case "$cf_opt" in
                        (Winline)
-                               case $GCC_VERSION in
+                               case "$GCC_VERSION" in
                                ([[34]].*)
                                        CF_VERBOSE(feature is broken in gcc $GCC_VERSION)
                                        continue;;
                                esac
                                ;;
                        (Wpointer-arith)
-                               case $GCC_VERSION in
+                               case "$GCC_VERSION" in
                                ([[12]].*)
                                        CF_VERBOSE(feature is broken in gcc $GCC_VERSION)
                                        continue;;
@@ -1191,7 +1601,7 @@ then
        done
        CFLAGS="$cf_save_CFLAGS"
 fi
-rm -rf conftest*
+rm -rf ./conftest*
 
 AC_SUBST(EXTRA_CFLAGS)
 ])dnl
@@ -1207,15 +1617,15 @@ test "$cf_cv_gnatprep_opt_t" = yes && GNATPREP_OPTS="-T $GNATPREP_OPTS"
 AC_SUBST(GNATPREP_OPTS)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_GNAT_GENERICS version: 3 updated: 2015/04/17 21:13:04
+dnl CF_GNAT_GENERICS version: 7 updated: 2021/01/01 13:31:04
 dnl ----------------
 AC_DEFUN([CF_GNAT_GENERICS],
 [
 AC_REQUIRE([CF_GNAT_VERSION])
 
 AC_MSG_CHECKING(if GNAT supports generics)
-case $cf_gnat_version in
-(3.[[1-9]]*|[[4-9]].*)
+case "$cf_cv_gnat_version" in
+(3.1[[1-9]]*|3.[[2-9]]*|[[4-9]].*|[[1-9]][[0-9]].[[0-9]]*|20[[0-9]][[0-9]])
        cf_gnat_generics=yes
        ;;
 (*)
@@ -1237,7 +1647,7 @@ AC_SUBST(cf_compile_generics)
 AC_SUBST(cf_generic_objects)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_GNAT_PROJECTS version: 8 updated: 2015/04/17 21:13:04
+dnl CF_GNAT_PROJECTS version: 13 updated: 2021/01/02 17:09:14
 dnl ----------------
 dnl GNAT projects are configured with ".gpr" project files.
 dnl GNAT libraries are a further development, using the project feature.
@@ -1251,18 +1661,20 @@ cf_gnat_projects=no
 
 if test "$enable_gnat_projects" != no ; then
 AC_MSG_CHECKING(if GNAT supports project files)
-case $cf_gnat_version in
+case "$cf_cv_gnat_version" in
 (3.[[0-9]]*)
        ;;
 (*)
-       case $cf_cv_system_name in
+       case "$cf_cv_system_name" in
        (cygwin*|msys*)
                ;;
        (*)
-               mkdir conftest.src conftest.bin conftest.lib
-               cd conftest.src
-               rm -rf conftest* *~conftest*
-               cat >>library.gpr <<CF_EOF
+               rm -rf ./conftest* ./*~conftest*
+               if mkdir conftest.src conftest.bin conftest.lib
+               then
+                       cd conftest.src
+                       rm -rf ./conftest* ./*~conftest*
+                       cat >>library.gpr <<CF_EOF
 project Library is
   Kind := External ("LIB_KIND");
   for Library_Name use "ConfTest";
@@ -1275,12 +1687,12 @@ project Library is
   for Source_Dirs use (Source_Dir);
 end Library;
 CF_EOF
-               cat >>confpackage.ads <<CF_EOF
+                       cat >>confpackage.ads <<CF_EOF
 package ConfPackage is
    procedure conftest;
 end ConfPackage;
 CF_EOF
-               cat >>confpackage.adb <<CF_EOF
+                       cat >>confpackage.adb <<CF_EOF
 with Text_IO;
 package body ConfPackage is
    procedure conftest is
@@ -1290,21 +1702,22 @@ package body ConfPackage is
    end conftest;
 end ConfPackage;
 CF_EOF
-               if ( $cf_ada_make $ADAFLAGS \
-                               -Plibrary.gpr \
-                               -XBUILD_DIR=`cd ../conftest.bin;pwd` \
-                               -XLIBRARY_DIR=`cd ../conftest.lib;pwd` \
-                               -XSOURCE_DIR=`pwd` \
-                               -XSONAME=libConfTest.so.1 \
-                               -XLIB_KIND=static 1>&AC_FD_CC 2>&1 ) ; then
-                       cf_gnat_projects=yes
+                       if ( "$cf_ada_make" $ADAFLAGS \
+                                       -Plibrary.gpr \
+                                       -XBUILD_DIR="`cd ../conftest.bin;pwd`" \
+                                       -XLIBRARY_DIR="`cd ../conftest.lib;pwd`" \
+                                       -XSOURCE_DIR="`pwd`" \
+                                       -XSONAME=libConfTest.so.1 \
+                                       -XLIB_KIND=static 1>&AC_FD_CC 2>&1 ) ; then
+                               cf_gnat_projects=yes
+                       fi
+                       cd ..
                fi
-               cd ..
                if test -f conftest.lib/confpackage.ali
                then
                        cf_gnat_libraries=yes
                fi
-               rm -rf conftest* *~conftest*
+               rm -rf ./conftest* ./*~conftest*
                ;;
        esac
        ;;
@@ -1312,19 +1725,30 @@ esac
 AC_MSG_RESULT($cf_gnat_projects)
 fi # enable_gnat_projects
 
-if test $cf_gnat_projects = yes
+if test "$cf_gnat_projects" = yes
 then
        AC_MSG_CHECKING(if GNAT supports libraries)
        AC_MSG_RESULT($cf_gnat_libraries)
 fi
 
+USE_OLD_MAKERULES=""
+USE_GNAT_PROJECTS="#"
+USE_GNAT_MAKE_GPR="#"
+USE_GNAT_GPRBUILD="#"
+
 if test "$cf_gnat_projects" = yes
 then
        USE_OLD_MAKERULES="#"
        USE_GNAT_PROJECTS=""
-else
-       USE_OLD_MAKERULES=""
-       USE_GNAT_PROJECTS="#"
+       if test "$cf_cv_VERSION_GPRBUILD" != no
+       then
+               USE_GNAT_GPRBUILD=""
+       elif test "$cf_cv_VERSION_GNATMAKE" != no
+       then
+               USE_GNAT_MAKE_GPR=""
+       else
+               AC_MSG_WARN(use old makefile rules since tools are missing)
+       fi
 fi
 
 if test "$cf_gnat_libraries" = yes
@@ -1337,9 +1761,11 @@ fi
 AC_SUBST(USE_OLD_MAKERULES)
 AC_SUBST(USE_GNAT_PROJECTS)
 AC_SUBST(USE_GNAT_LIBRARIES)
+AC_SUBST(USE_GNAT_MAKE_GPR)
+AC_SUBST(USE_GNAT_GPRBUILD)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_GNAT_SIGINT version: 1 updated: 2011/03/27 20:07:59
+dnl CF_GNAT_SIGINT version: 2 updated: 2021/01/01 13:31:04
 dnl --------------
 dnl Check if gnat supports SIGINT, and presumably tasking.  For the latter, it
 dnl is noted that gnat may compile a tasking unit even for configurations which
@@ -1378,7 +1804,7 @@ end ConfTest;],
        [cf_cv_gnat_sigint=yes],
        [cf_cv_gnat_sigint=no])])
 
-if test $cf_cv_gnat_sigint = yes ; then
+if test "$cf_cv_gnat_sigint" = yes ; then
        USE_GNAT_SIGINT=""
 else
        USE_GNAT_SIGINT="#"
@@ -1386,7 +1812,7 @@ fi
 AC_SUBST(USE_GNAT_SIGINT)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_GNAT_TRY_LINK version: 3 updated: 2011/03/19 14:47:45
+dnl CF_GNAT_TRY_LINK version: 4 updated: 2021/01/01 13:31:04
 dnl ----------------
 dnl Verify that a test program compiles/links with GNAT.
 dnl $cf_ada_make is set to the program that compiles/links
@@ -1398,22 +1824,22 @@ dnl $3 is the shell command to execute if successful
 dnl $4 is the shell command to execute if not successful
 AC_DEFUN([CF_GNAT_TRY_LINK],
 [
-rm -rf conftest* *~conftest*
+rm -rf ./conftest* ./*~conftest*
 cat >>conftest.ads <<CF_EOF
 $1
 CF_EOF
 cat >>conftest.adb <<CF_EOF
 $2
 CF_EOF
-if ( $cf_ada_make $ADAFLAGS conftest 1>&AC_FD_CC 2>&1 ) ; then
+if ( "$cf_ada_make" $ADAFLAGS conftest 1>&AC_FD_CC 2>&1 ) ; then
 ifelse($3,,      :,[      $3])
 ifelse($4,,,[else
    $4])
 fi
-rm -rf conftest* *~conftest*
+rm -rf ./conftest* ./*~conftest*
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_GNAT_TRY_RUN version: 5 updated: 2011/03/19 14:47:45
+dnl CF_GNAT_TRY_RUN version: 6 updated: 2021/01/01 13:31:04
 dnl ---------------
 dnl Verify that a test program compiles and runs with GNAT
 dnl $cf_ada_make is set to the program that compiles/links
@@ -1425,14 +1851,14 @@ dnl $3 is the shell command to execute if successful
 dnl $4 is the shell command to execute if not successful
 AC_DEFUN([CF_GNAT_TRY_RUN],
 [
-rm -rf conftest* *~conftest*
+rm -rf ./conftest* ./*~conftest*
 cat >>conftest.ads <<CF_EOF
 $1
 CF_EOF
 cat >>conftest.adb <<CF_EOF
 $2
 CF_EOF
-if ( $cf_ada_make $ADAFLAGS conftest 1>&AC_FD_CC 2>&1 ) ; then
+if ( "$cf_ada_make" $ADAFLAGS conftest 1>&AC_FD_CC 2>&1 ) ; then
    if ( ./conftest 1>&AC_FD_CC 2>&1 ) ; then
 ifelse($3,,      :,[      $3])
 ifelse($4,,,[   else
@@ -1441,32 +1867,26 @@ ifelse($4,,,[   else
 ifelse($4,,,[else
    $4])
 fi
-rm -rf conftest* *~conftest*
+rm -rf ./conftest* ./*~conftest*
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_GNAT_VERSION version: 20 updated: 2015/04/18 08:56:57
+dnl CF_GNAT_VERSION version: 22 updated: 2019/12/31 08:53:54
 dnl ---------------
-dnl Verify version of GNAT.
+dnl $1 = cache variable to update
+dnl $2 = program name
+dnl Verify version of GNAT or related tool
 AC_DEFUN([CF_GNAT_VERSION],
 [
-AC_MSG_CHECKING(for gnat version)
-cf_gnat_version=`${cf_ada_make:-gnatmake} -v 2>&1 | \
+AC_CACHE_CHECK(for ifelse($2,,gnat,$2) version, cf_cv_gnat_version,[
+cf_cv_gnat_version=`ifelse($2,,${cf_ada_make:-gnatmake},$2) --version 2>&1 | \
        grep '[[0-9]].[[0-9]][[0-9]]*' |\
        sed -e '2,$d' -e 's/[[^0-9 \.]]//g' -e 's/^[[ ]]*//' -e 's/ .*//'`
-AC_MSG_RESULT($cf_gnat_version)
-
-case $cf_gnat_version in
-(3.1[[1-9]]*|3.[[2-9]]*|[[4-9]].*|20[[0-9]][[0-9]])
-       cf_cv_prog_gnat_correct=yes
-       ;;
-(*)
-       AC_MSG_WARN(Unsupported GNAT version $cf_gnat_version. We require 3.11 or better. Disabling Ada95 binding.)
-       cf_cv_prog_gnat_correct=no
-       ;;
-esac
 ])
+test -z "$cf_cv_gnat_version" && cf_cv_gnat_version=no
+ifelse($1,,,[eval $1=$cf_cv_gnat_version; unset cf_cv_gnat_version])
+])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_GNU_SOURCE version: 6 updated: 2005/07/09 13:23:07
+dnl CF_GNU_SOURCE version: 10 updated: 2018/12/10 20:09:41
 dnl -------------
 dnl Check if we must define _GNU_SOURCE to get a reasonable value for
 dnl _XOPEN_SOURCE, upon which many POSIX definitions depend.  This is a defect
@@ -1474,29 +1894,110 @@ dnl (or misfeature) of glibc2, which breaks portability of many applications,
 dnl since it is interwoven with GNU extensions.
 dnl
 dnl Well, yes we could work around it...
+dnl
+dnl Parameters:
+dnl    $1 is the nominal value for _XOPEN_SOURCE
 AC_DEFUN([CF_GNU_SOURCE],
 [
-AC_CACHE_CHECK(if we must define _GNU_SOURCE,cf_cv_gnu_source,[
+cf_gnu_xopen_source=ifelse($1,,500,$1)
+
+AC_CACHE_CHECK(if this is the GNU C library,cf_cv_gnu_library,[
 AC_TRY_COMPILE([#include <sys/types.h>],[
-#ifndef _XOPEN_SOURCE
-make an error
-#endif],
-       [cf_cv_gnu_source=no],
-       [cf_save="$CPPFLAGS"
-        CPPFLAGS="$CPPFLAGS -D_GNU_SOURCE"
-        AC_TRY_COMPILE([#include <sys/types.h>],[
-#ifdef _XOPEN_SOURCE
-make an error
-#endif],
-       [cf_cv_gnu_source=no],
-       [cf_cv_gnu_source=yes])
-       CPPFLAGS="$cf_save"
-       ])
+       #if __GLIBC__ > 0 && __GLIBC_MINOR__ >= 0
+               return 0;
+       #elif __NEWLIB__ > 0 && __NEWLIB_MINOR__ >= 0
+               return 0;
+       #else
+       #       error not GNU C library
+       #endif],
+       [cf_cv_gnu_library=yes],
+       [cf_cv_gnu_library=no])
 ])
-test "$cf_cv_gnu_source" = yes && CPPFLAGS="$CPPFLAGS -D_GNU_SOURCE"
+
+if test x$cf_cv_gnu_library = xyes; then
+
+       # With glibc 2.19 (13 years after this check was begun), _DEFAULT_SOURCE
+       # was changed to help a little.  newlib incorporated the change about 4
+       # years later.
+       AC_CACHE_CHECK(if _DEFAULT_SOURCE can be used as a basis,cf_cv_gnu_library_219,[
+               cf_save="$CPPFLAGS"
+               CF_APPEND_TEXT(CPPFLAGS,-D_DEFAULT_SOURCE)
+               AC_TRY_COMPILE([#include <sys/types.h>],[
+                       #if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 19) || (__GLIBC__ > 2)
+                               return 0;
+                       #elif (__NEWLIB__ == 2 && __NEWLIB_MINOR__ >= 4) || (__GLIBC__ > 3)
+                               return 0;
+                       #else
+                       #       error GNU C library __GLIBC__.__GLIBC_MINOR__ is too old
+                       #endif],
+                       [cf_cv_gnu_library_219=yes],
+                       [cf_cv_gnu_library_219=no])
+               CPPFLAGS="$cf_save"
+       ])
+
+       if test "x$cf_cv_gnu_library_219" = xyes; then
+               cf_save="$CPPFLAGS"
+               AC_CACHE_CHECK(if _XOPEN_SOURCE=$cf_gnu_xopen_source works with _DEFAULT_SOURCE,cf_cv_gnu_dftsrc_219,[
+                       CF_ADD_CFLAGS(-D_DEFAULT_SOURCE -D_XOPEN_SOURCE=$cf_gnu_xopen_source)
+                       AC_TRY_COMPILE([
+                               #include <limits.h>
+                               #include <sys/types.h>
+                               ],[
+                               #if (_XOPEN_SOURCE >= $cf_gnu_xopen_source) && (MB_LEN_MAX > 1)
+                                       return 0;
+                               #else
+                               #       error GNU C library is too old
+                               #endif],
+                               [cf_cv_gnu_dftsrc_219=yes],
+                               [cf_cv_gnu_dftsrc_219=no])
+                       ])
+               test "x$cf_cv_gnu_dftsrc_219" = "xyes" || CPPFLAGS="$cf_save"
+       else
+               cf_cv_gnu_dftsrc_219=maybe
+       fi
+
+       if test "x$cf_cv_gnu_dftsrc_219" != xyes; then
+
+               AC_CACHE_CHECK(if we must define _GNU_SOURCE,cf_cv_gnu_source,[
+               AC_TRY_COMPILE([#include <sys/types.h>],[
+                       #ifndef _XOPEN_SOURCE
+                       #error  expected _XOPEN_SOURCE to be defined
+                       #endif],
+                       [cf_cv_gnu_source=no],
+                       [cf_save="$CPPFLAGS"
+                        CF_ADD_CFLAGS(-D_GNU_SOURCE)
+                        AC_TRY_COMPILE([#include <sys/types.h>],[
+                               #ifdef _XOPEN_SOURCE
+                               #error  expected _XOPEN_SOURCE to be undefined
+                               #endif],
+                               [cf_cv_gnu_source=no],
+                               [cf_cv_gnu_source=yes])
+                       CPPFLAGS="$cf_save"
+                       ])
+               ])
+
+               if test "$cf_cv_gnu_source" = yes
+               then
+               AC_CACHE_CHECK(if we should also define _DEFAULT_SOURCE,cf_cv_default_source,[
+                       CF_APPEND_TEXT(CPPFLAGS,-D_GNU_SOURCE)
+                       AC_TRY_COMPILE([#include <sys/types.h>],[
+                               #ifdef _DEFAULT_SOURCE
+                               #error  expected _DEFAULT_SOURCE to be undefined
+                               #endif],
+                               [cf_cv_default_source=no],
+                               [cf_cv_default_source=yes])
+                       ])
+                       if test "$cf_cv_default_source" = yes
+                       then
+                               CF_APPEND_TEXT(CPPFLAGS,-D_DEFAULT_SOURCE)
+                       fi
+               fi
+       fi
+
+fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_HEADER_PATH version: 13 updated: 2015/04/15 19:08:48
+dnl CF_HEADER_PATH version: 15 updated: 2021/01/01 13:31:04
 dnl --------------
 dnl Construct a search-list of directories for a nonstandard header-file
 dnl
@@ -1512,7 +2013,7 @@ cf_header_path_list=""
 if test -n "${CFLAGS}${CPPFLAGS}" ; then
        for cf_header_path in $CPPFLAGS $CFLAGS
        do
-               case $cf_header_path in
+               case "$cf_header_path" in
                (-I*)
                        cf_header_path=`echo ".$cf_header_path" |sed -e 's/^...//' -e 's,/include$,,'`
                        CF_ADD_SUBDIR_PATH($1,$2,include,$cf_header_path,NONE)
@@ -1528,25 +2029,26 @@ CF_SUBDIR_PATH($1,$2,include)
 test "$includedir" != NONE && \
 test "$includedir" != "/usr/include" && \
 test -d "$includedir" && {
-       test -d $includedir &&    $1="[$]$1 $includedir"
-       test -d $includedir/$2 && $1="[$]$1 $includedir/$2"
+       test -d "$includedir" &&    $1="[$]$1 $includedir"
+       test -d "$includedir/$2" && $1="[$]$1 $includedir/$2"
 }
 
 test "$oldincludedir" != NONE && \
 test "$oldincludedir" != "/usr/include" && \
 test -d "$oldincludedir" && {
-       test -d $oldincludedir    && $1="[$]$1 $oldincludedir"
-       test -d $oldincludedir/$2 && $1="[$]$1 $oldincludedir/$2"
+       test -d "$oldincludedir"    && $1="[$]$1 $oldincludedir"
+       test -d "$oldincludedir/$2" && $1="[$]$1 $oldincludedir/$2"
 }
 
 $1="[$]$1 $cf_header_path_list"
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_HELP_MESSAGE version: 3 updated: 1998/01/14 10:56:23
+dnl CF_HELP_MESSAGE version: 4 updated: 2019/12/31 08:53:54
 dnl ---------------
 dnl Insert text into the help-message, for readability, from AC_ARG_WITH.
 AC_DEFUN([CF_HELP_MESSAGE],
-[AC_DIVERT_HELP([$1])dnl
+[CF_ACVERSION_CHECK(2.53,[],[
+AC_DIVERT_HELP($1)])dnl
 ])dnl
 dnl ---------------------------------------------------------------------------
 dnl CF_INCLUDE_DIRS version: 10 updated: 2014/09/19 20:58:42
@@ -1566,7 +2068,101 @@ CPPFLAGS="-I. $CPPFLAGS"
 AC_SUBST(CPPFLAGS)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_INTEL_COMPILER version: 7 updated: 2015/04/12 15:39:00
+dnl CF_INSTALL_OPTS version: 2 updated: 2018/08/18 12:19:21
+dnl ---------------
+dnl prompt for/fill-in useful install-program options
+AC_DEFUN([CF_INSTALL_OPTS],
+[
+CF_INSTALL_OPT_S
+CF_INSTALL_OPT_P
+CF_INSTALL_OPT_O
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_INSTALL_OPT_O version: 3 updated: 2020/12/31 20:19:42
+dnl ----------------
+dnl Almost all "install" programs default to the current user's ownership.
+dnl Almost - MINIX is an exception.
+AC_DEFUN([CF_INSTALL_OPT_O],
+[
+AC_MSG_CHECKING(if install needs to be told about ownership)
+case `$ac_config_guess` in
+(*minix)
+       with_install_o=yes
+       ;;
+(*)
+       with_install_o=no
+       ;;
+esac
+
+AC_MSG_RESULT($with_install_o)
+if test "x$with_install_o" = xyes
+then
+       INSTALL_OPT_O="`id root|sed -e 's/uid=[[0-9]]*(/ -o /' -e 's/gid=[[0-9]]*(/ -g /' -e 's/ [[^=[:space:]]][[^=[:space:]]]*=.*/ /' -e 's/)//g'`"
+else
+       INSTALL_OPT_O=
+fi
+
+AC_SUBST(INSTALL_OPT_O)
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_INSTALL_OPT_P version: 3 updated: 2021/01/01 13:31:04
+dnl ----------------
+dnl Some install-programs accept a "-p" option to preserve file modification
+dnl timestamps.  That can be useful as an install option, as well as a way to
+dnl avoid the need for ranlib after copying a static archive.
+AC_DEFUN([CF_INSTALL_OPT_P],
+[
+: "${INSTALL:=install}"
+AC_CACHE_CHECK(if install accepts -p option, cf_cv_install_p,[
+       rm -rf ./conftest*
+       date >conftest.in
+       mkdir conftest.out
+       sleep 3
+       if $INSTALL -p conftest.in conftest.out 2>/dev/null
+       then
+               if test -f conftest.out/conftest.in
+               then
+                       test conftest.in -nt conftest.out/conftest.in 2>conftest.err && \
+                       test conftest.out/conftest.in -nt conftest.in 2>conftest.err
+                       if test -s conftest.err
+                       then
+                               cf_cv_install_p=no
+                       else
+                               cf_cv_install_p=yes
+                       fi
+               else
+                       cf_cv_install_p=no
+               fi
+       else
+               cf_cv_install_p=no
+       fi
+       rm -rf ./conftest*
+])
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_INSTALL_OPT_S version: 3 updated: 2021/01/05 19:23:48
+dnl ----------------
+dnl By default, we should strip executables which are installed, but leave the
+dnl ability to suppress that for unit-testing.
+AC_DEFUN([CF_INSTALL_OPT_S],
+[
+AC_MSG_CHECKING(if you want to install stripped executables)
+CF_ARG_DISABLE(stripping,
+       [  --disable-stripping     do not strip (debug info) installed executables],
+       [enable_stripping=no],
+       [enable_stripping=yes])
+AC_MSG_RESULT($enable_stripping)
+
+if test "$enable_stripping" = yes
+then
+       INSTALL_OPT_S="-s"
+else
+       INSTALL_OPT_S=
+fi
+AC_SUBST(INSTALL_OPT_S)
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_INTEL_COMPILER version: 8 updated: 2021/01/01 16:53:59
 dnl -----------------
 dnl Check if the given compiler is really the Intel compiler for Linux.  It
 dnl tries to imitate gcc, but does not return an error when it finds a mismatch
@@ -1584,7 +2180,7 @@ AC_REQUIRE([AC_CANONICAL_HOST])
 ifelse([$2],,INTEL_COMPILER,[$2])=no
 
 if test "$ifelse([$1],,[$1],GCC)" = yes ; then
-       case $host_os in
+       case "$host_os" in
        (linux*|gnu*)
                AC_MSG_CHECKING(if this is really Intel ifelse([$1],GXX,C++,C) compiler)
                cf_save_CFLAGS="$ifelse([$3],,CFLAGS,[$3])"
@@ -1604,7 +2200,7 @@ cf_save_CFLAGS="$cf_save_CFLAGS -we147"
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_LARGEFILE version: 9 updated: 2015/04/18 08:56:57
+dnl CF_LARGEFILE version: 12 updated: 2020/03/19 20:23:48
 dnl ------------
 dnl Add checks for large file support.
 AC_DEFUN([CF_LARGEFILE],[
@@ -1620,12 +2216,22 @@ ifdef([AC_FUNC_FSEEKO],[
        # header files by themselves before looking at the body files it is
        # told to compile.  For ncurses, those header files do not include
        # the config.h
-       test "$ac_cv_sys_large_files"      != no && CPPFLAGS="$CPPFLAGS -D_LARGE_FILES "
-       test "$ac_cv_sys_largefile_source" != no && CPPFLAGS="$CPPFLAGS -D_LARGEFILE_SOURCE "
-       test "$ac_cv_sys_file_offset_bits" != no && CPPFLAGS="$CPPFLAGS -D_FILE_OFFSET_BITS=$ac_cv_sys_file_offset_bits "
+       if test "$ac_cv_sys_large_files" != no
+       then
+               CF_APPEND_TEXT(CPPFLAGS,-D_LARGE_FILES)
+       fi
+       if test "$ac_cv_sys_largefile_source" != no
+       then
+               CF_APPEND_TEXT(CPPFLAGS,-D_LARGEFILE_SOURCE)
+       fi
+       if test "$ac_cv_sys_file_offset_bits" != no
+       then
+               CF_APPEND_TEXT(CPPFLAGS,-D_FILE_OFFSET_BITS=$ac_cv_sys_file_offset_bits)
+       fi
 
        AC_CACHE_CHECK(whether to use struct dirent64, cf_cv_struct_dirent64,[
                AC_TRY_COMPILE([
+#pragma GCC diagnostic error "-Wincompatible-pointer-types"
 #include <sys/types.h>
 #include <dirent.h>
                ],[
@@ -1634,6 +2240,7 @@ ifdef([AC_FUNC_FSEEKO],[
                struct dirent64 *x = readdir((DIR *)0);
                struct dirent *y = readdir((DIR *)0);
                int z = x - y;
+               (void)z;
                ],
                [cf_cv_struct_dirent64=yes],
                [cf_cv_struct_dirent64=no])
@@ -1643,7 +2250,7 @@ ifdef([AC_FUNC_FSEEKO],[
 ])
 ])
 dnl ---------------------------------------------------------------------------
-dnl CF_LD_RPATH_OPT version: 7 updated: 2016/02/20 18:01:19
+dnl CF_LD_RPATH_OPT version: 9 updated: 2021/01/01 13:31:04
 dnl ---------------
 dnl For the given system and compiler, find the compiler flags to pass to the
 dnl loader to use the "rpath" feature.
@@ -1652,52 +2259,55 @@ AC_DEFUN([CF_LD_RPATH_OPT],
 AC_REQUIRE([CF_CHECK_CACHE])
 
 LD_RPATH_OPT=
-AC_MSG_CHECKING(for an rpath option)
-case $cf_cv_system_name in
-(irix*)
-       if test "$GCC" = yes; then
+if test "x$cf_cv_enable_rpath" != xno
+then
+       AC_MSG_CHECKING(for an rpath option)
+       case "$cf_cv_system_name" in
+       (irix*)
+               if test "$GCC" = yes; then
+                       LD_RPATH_OPT="-Wl,-rpath,"
+               else
+                       LD_RPATH_OPT="-rpath "
+               fi
+               ;;
+       (linux*|gnu*|k*bsd*-gnu|freebsd*)
                LD_RPATH_OPT="-Wl,-rpath,"
-       else
+               ;;
+       (openbsd[[2-9]].*|mirbsd*)
+               LD_RPATH_OPT="-Wl,-rpath,"
+               ;;
+       (dragonfly*)
                LD_RPATH_OPT="-rpath "
-       fi
-       ;;
-(linux*|gnu*|k*bsd*-gnu|freebsd*)
-       LD_RPATH_OPT="-Wl,-rpath,"
-       ;;
-(openbsd[[2-9]].*|mirbsd*)
-       LD_RPATH_OPT="-Wl,-rpath,"
-       ;;
-(dragonfly*)
-       LD_RPATH_OPT="-rpath "
-       ;;
-(netbsd*)
-       LD_RPATH_OPT="-Wl,-rpath,"
-       ;;
-(osf*|mls+*)
-       LD_RPATH_OPT="-rpath "
-       ;;
-(solaris2*)
-       LD_RPATH_OPT="-R"
-       ;;
-(*)
-       ;;
-esac
-AC_MSG_RESULT($LD_RPATH_OPT)
+               ;;
+       (netbsd*)
+               LD_RPATH_OPT="-Wl,-rpath,"
+               ;;
+       (osf*|mls+*)
+               LD_RPATH_OPT="-rpath "
+               ;;
+       (solaris2*)
+               LD_RPATH_OPT="-R"
+               ;;
+       (*)
+               ;;
+       esac
+       AC_MSG_RESULT($LD_RPATH_OPT)
 
-case "x$LD_RPATH_OPT" in
-(x-R*)
-       AC_MSG_CHECKING(if we need a space after rpath option)
-       cf_save_LIBS="$LIBS"
-       CF_ADD_LIBS(${LD_RPATH_OPT}$libdir)
-       AC_TRY_LINK(, , cf_rpath_space=no, cf_rpath_space=yes)
-       LIBS="$cf_save_LIBS"
-       AC_MSG_RESULT($cf_rpath_space)
-       test "$cf_rpath_space" = yes && LD_RPATH_OPT="$LD_RPATH_OPT "
-       ;;
-esac
+       case "x$LD_RPATH_OPT" in
+       (x-R*)
+               AC_MSG_CHECKING(if we need a space after rpath option)
+               cf_save_LIBS="$LIBS"
+               CF_ADD_LIBS(${LD_RPATH_OPT}$libdir)
+               AC_TRY_LINK(, , cf_rpath_space=no, cf_rpath_space=yes)
+               LIBS="$cf_save_LIBS"
+               AC_MSG_RESULT($cf_rpath_space)
+               test "$cf_rpath_space" = yes && LD_RPATH_OPT="$LD_RPATH_OPT "
+               ;;
+       esac
+fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_LIBRARY_PATH version: 10 updated: 2015/04/15 19:08:48
+dnl CF_LIBRARY_PATH version: 11 updated: 2021/01/01 13:31:04
 dnl ---------------
 dnl Construct a search-list of directories for a nonstandard library-file
 dnl
@@ -1711,7 +2321,7 @@ cf_library_path_list=""
 if test -n "${LDFLAGS}${LIBS}" ; then
        for cf_library_path in $LDFLAGS $LIBS
        do
-               case $cf_library_path in
+               case "$cf_library_path" in
                (-L*)
                        cf_library_path=`echo ".$cf_library_path" |sed -e 's/^...//' -e 's,/lib$,,'`
                        CF_ADD_SUBDIR_PATH($1,$2,lib,$cf_library_path,NONE)
@@ -1726,13 +2336,13 @@ CF_SUBDIR_PATH($1,$2,lib)
 $1="$cf_library_path_list [$]$1"
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_LIB_PREFIX version: 12 updated: 2015/10/17 19:03:33
+dnl CF_LIB_PREFIX version: 14 updated: 2021/01/01 13:31:04
 dnl -------------
 dnl Compute the library-prefix for the given host system
 dnl $1 = variable to set
 define([CF_LIB_PREFIX],
 [
-       case $cf_cv_system_name in
+       case "$cf_cv_system_name" in
        (OS/2*|os2*)
                if test "$DFT_LWR_MODEL" = libtool; then
                        LIB_PREFIX='lib'
@@ -1740,6 +2350,9 @@ define([CF_LIB_PREFIX],
                        LIB_PREFIX=''
                fi
                ;;
+       (*-msvc*)
+               LIB_PREFIX=''
+               ;;
        (*)     LIB_PREFIX='lib'
                ;;
        esac
@@ -1747,7 +2360,7 @@ ifelse($1,,,[$1=$LIB_PREFIX])
        AC_SUBST(LIB_PREFIX)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_LIB_SUFFIX version: 25 updated: 2015/04/17 21:13:04
+dnl CF_LIB_SUFFIX version: 28 updated: 2021/01/01 16:53:59
 dnl -------------
 dnl Compute the library file-suffix from the given model name
 dnl $1 = model name
@@ -1762,19 +2375,37 @@ AC_DEFUN([CF_LIB_SUFFIX],
                $3=[$]$2
                ;;
        (Xdebug)
-               $2='_g.a'
+               case "$cf_cv_system_name" in
+               (*-msvc*)
+                       $2='_g.lib'
+                       ;;
+               (*)
+                       $2='_g.a'
+                       ;;
+               esac
                $3=[$]$2
                ;;
        (Xprofile)
-               $2='_p.a'
+               case "$cf_cv_system_name" in
+               (*-msvc*)
+                       $2='_p.lib'
+                       ;;
+               (*)
+                       $2='_p.a'
+                       ;;
+               esac
                $3=[$]$2
                ;;
        (Xshared)
-               case $cf_cv_system_name in
+               case "$cf_cv_system_name" in
                (aix[[5-7]]*)
                        $2='.so'
                        $3=[$]$2
                        ;;
+               (*-msvc*)
+                       $2='.dll'
+                       $3='.dll.lib'
+                       ;;
                (cygwin*|msys*|mingw*)
                        $2='.dll'
                        $3='.dll.a'
@@ -1784,7 +2415,7 @@ AC_DEFUN([CF_LIB_SUFFIX],
                        $3=[$]$2
                        ;;
                (hpux*)
-                       case $target in
+                       case "$target" in
                        (ia64*)
                                $2='.so'
                                $3=[$]$2
@@ -1802,7 +2433,14 @@ AC_DEFUN([CF_LIB_SUFFIX],
                esac
                ;;
        (*)
-               $2='.a'
+               case "$target" in
+               (*-msvc*)
+                       $2='.lib'
+                       ;;
+               (*)
+                       $2='.a'
+                       ;;
+               esac
                $3=[$]$2
                ;;
        esac
@@ -1831,7 +2469,7 @@ AC_DEFUN([CF_LIB_TYPE],
        test -n "$LIB_SUFFIX" && $2="${LIB_SUFFIX}[$]{$2}"
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_LINK_DATAONLY version: 10 updated: 2012/10/06 17:41:51
+dnl CF_LINK_DATAONLY version: 13 updated: 2020/02/08 15:59:30
 dnl ----------------
 dnl Some systems have a non-ANSI linker that doesn't pull in modules that have
 dnl only data (i.e., no functions), for example NeXT.  On those systems we'll
@@ -1853,7 +2491,7 @@ EOF
        rm -f conftest.$ac_ext data.o
        cat >conftest.$ac_ext <<EOF
 #line __oline__ "configure"
-int    testfunc()
+int    testfunc(void)
 {
 #if defined(NeXT)
        ${cf_cv_main_return:-return}(1);        /* I'm told this linker is broken */
@@ -1874,7 +2512,7 @@ EOF
        cf_saveLIBS="$LIBS"
        LIBS="conftest.a $LIBS"
        AC_TRY_RUN([
-       int main()
+       int main(void)
        {
                extern int testfunc();
                ${cf_cv_main_return:-return} (!testfunc());
@@ -1891,17 +2529,19 @@ if test "$cf_cv_link_dataonly" = no ; then
        AC_DEFINE(BROKEN_LINKER,1,[if data-only library module does not link])
        BROKEN_LINKER=1
 fi
+AC_SUBST(BROKEN_LINKER)
 
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_MAKEFLAGS version: 17 updated: 2015/08/05 20:44:28
+dnl CF_MAKEFLAGS version: 21 updated: 2021/09/04 06:47:34
 dnl ------------
 dnl Some 'make' programs support ${MAKEFLAGS}, some ${MFLAGS}, to pass 'make'
-dnl options to lower-levels.  It's very useful for "make -n" -- if we have it.
+dnl options to lower-levels.  It is very useful for "make -n" -- if we have it.
 dnl (GNU 'make' does both, something POSIX 'make', which happens to make the
 dnl ${MAKEFLAGS} variable incompatible because it adds the assignments :-)
 AC_DEFUN([CF_MAKEFLAGS],
-[
+[AC_REQUIRE([AC_PROG_FGREP])dnl
+
 AC_CACHE_CHECK(for makeflags variable, cf_cv_makeflags,[
        cf_cv_makeflags=''
        for cf_option in '-${MAKEFLAGS}' '${MFLAGS}'
@@ -1911,10 +2551,10 @@ SHELL = $SHELL
 all :
        @ echo '.$cf_option'
 CF_EOF
-               cf_result=`${MAKE:-make} -k -f cf_makeflags.tmp 2>/dev/null | fgrep -v "ing directory" | sed -e 's,[[   ]]*$,,'`
+               cf_result=`${MAKE:-make} -k -f cf_makeflags.tmp 2>/dev/null | ${FGREP-fgrep} -v "ing directory" | sed -e 's,[[  ]]*$,,'`
                case "$cf_result" in
                (.*k|.*kw)
-                       cf_result=`${MAKE:-make} -k -f cf_makeflags.tmp CC=cc 2>/dev/null`
+                       cf_result="`${MAKE:-make} -k -f cf_makeflags.tmp CC=cc 2>/dev/null`"
                        case "$cf_result" in
                        (.*CC=*)        cf_cv_makeflags=
                                ;;
@@ -1923,8 +2563,10 @@ CF_EOF
                        esac
                        break
                        ;;
-               (.-)    ;;
-               (*)     echo "given option \"$cf_option\", no match \"$cf_result\""
+               (.-)
+                       ;;
+               (*)
+                       CF_MSG_LOG(given option \"$cf_option\", no match \"$cf_result\")
                        ;;
                esac
        done
@@ -1934,6 +2576,89 @@ CF_EOF
 AC_SUBST(cf_cv_makeflags)
 ])dnl
 dnl ---------------------------------------------------------------------------
+dnl CF_MAKE_PHONY version: 3 updated: 2021/01/08 16:08:21
+dnl -------------
+dnl Check if the make-program handles a ".PHONY" target, e.g,. a target which
+dnl acts as a placeholder.
+dnl
+dnl The ".PHONY" feature was proposed in 2011 here
+dnl     https://www.austingroupbugs.net/view.php?id=523
+dnl and is scheduled for release in P1003.1 Issue 8 (late 2022).
+dnl
+dnl This is not supported by SVr4 make (or SunOS 4, 4.3SD, etc), but works with
+dnl a few others (i.e., GNU make and the non-POSIX "BSD" make):
+dnl
+dnl + This is a GNU make feature (since April 1988, but in turn from binutils,
+dnl   date unspecified).
+dnl
+dnl + It was adopted in NetBSD make in June 1995.
+dnl
+dnl + The other BSD make programs are derived from the NetBSD make (and for
+dnl   that reason are not actually different "implementations").
+dnl
+dnl + Some features of NetBSD make were actually adapted from pmake, which
+dnl   began as a modified GNU make starting in 1993.
+dnl
+dnl + Version 3.8 of the dmake program in January 1992 also implemented this
+dnl   GNU make extension, but is less well known than the BSD make.
+AC_DEFUN([CF_MAKE_PHONY],[
+AC_CACHE_CHECK(for \".PHONY\" make-support, cf_cv_make_PHONY,[
+       rm -rf conftest*
+       (
+               mkdir conftest || exit 1
+               cd conftest
+               cat >makefile <<'CF_EOF'
+.PHONY: always
+DATA=0
+always:        always.out
+       @echo "** making [$]@ [$](DATA)"
+once: once.out
+       @echo "** making [$]@ [$](DATA)"
+always.out:
+       @echo "** making [$]@ [$](DATA)"
+       echo [$](DATA) > [$]@
+once.out:
+       @echo "** making [$]@ [$](DATA)"
+       echo [$](DATA) > [$]@
+CF_EOF
+               for cf_data in 1 2 3
+               do
+                       ${MAKE:-make} always DATA=$cf_data
+                       ${MAKE:-make} once   DATA=$cf_data
+                       ${MAKE:-make} -t always once
+                       if test -f always ; then
+                               echo "no (case 1)" > ../conftest.tmp
+                       elif test ! -f always.out ; then
+                               echo "no (case 2)" > ../conftest.tmp
+                       elif test ! -f once.out ; then
+                               echo "no (case 3)" > ../conftest.tmp
+                       elif ! cmp -s always.out once.out ; then
+                               echo "no (case 4)" > ../conftest.tmp
+                               diff always.out once.out
+                       else
+                               cf_check="`cat always.out`"
+                               if test "x$cf_check" != "x$cf_data" ; then
+                                       echo "no (case 5)" > ../conftest.tmp
+                               else
+                                       echo yes > ../conftest.tmp
+                                       rm -f ./*.out
+                                       continue
+                               fi
+                       fi
+                       break
+               done
+       ) >&AC_FD_CC 2>&1
+       cf_cv_make_PHONY="`cat conftest.tmp`"
+       rm -rf conftest*
+])
+MAKE_NO_PHONY="#"
+MAKE_PHONY="#"
+test "x$cf_cv_make_PHONY" = xyes && MAKE_PHONY=
+test "x$cf_cv_make_PHONY" != xyes && MAKE_NO_PHONY=
+AC_SUBST(MAKE_NO_PHONY)
+AC_SUBST(MAKE_PHONY)
+])dnl
+dnl ---------------------------------------------------------------------------
 dnl CF_MAKE_TAGS version: 6 updated: 2010/10/23 15:52:32
 dnl ------------
 dnl Generate tags/TAGS targets for makefiles.  Do not generate TAGS if we have
@@ -1971,7 +2696,7 @@ AC_SUBST(MAKE_UPPER_TAGS)
 AC_SUBST(MAKE_LOWER_TAGS)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_MIXEDCASE_FILENAMES version: 7 updated: 2015/04/12 15:39:00
+dnl CF_MIXEDCASE_FILENAMES version: 9 updated: 2021/01/01 16:53:59
 dnl ----------------------
 dnl Check if the file-system supports mixed-case filenames.  If we're able to
 dnl create a lowercase name and see it as uppercase, it doesn't support that.
@@ -1979,8 +2704,8 @@ AC_DEFUN([CF_MIXEDCASE_FILENAMES],
 [
 AC_CACHE_CHECK(if filesystem supports mixed-case filenames,cf_cv_mixedcase,[
 if test "$cross_compiling" = yes ; then
-       case $target_alias in
-       (*-os2-emx*|*-msdosdjgpp*|*-cygwin*|*-msys*|*-mingw*|*-uwin*)
+       case "$target_alias" in
+       (*-os2-emx*|*-msdosdjgpp*|*-cygwin*|*-msys*|*-mingw*|*-uwin*|darwin*)
                cf_cv_mixedcase=no
                ;;
        (*)
@@ -2001,20 +2726,26 @@ fi
 test "$cf_cv_mixedcase" = yes && AC_DEFINE(MIXEDCASE_FILENAMES,1,[Define to 1 if filesystem supports mixed-case filenames.])
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_MKSTEMP version: 9 updated: 2012/10/03 04:34:49
+dnl CF_MKSTEMP version: 11 updated: 2021/01/01 13:31:04
 dnl ----------
 dnl Check for a working mkstemp.  This creates two files, checks that they are
 dnl successfully created and distinct (AmigaOS apparently fails on the last).
 AC_DEFUN([CF_MKSTEMP],[
+AC_CHECK_HEADERS( \
+unistd.h \
+)
 AC_CACHE_CHECK(for working mkstemp, cf_cv_func_mkstemp,[
-rm -rf conftest*
+rm -rf ./conftest*
 AC_TRY_RUN([
 #include <sys/types.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
 #include <sys/stat.h>
-int main()
+int main(void)
 {
        char *tmpl = "conftestXXXXXX";
        char name[2][80];
@@ -2061,7 +2792,7 @@ AC_DEFUN([CF_MSG_LOG],[
 echo "${as_me:-configure}:__oline__: testing $* ..." 1>&AC_FD_CC
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_NCURSES_ADDON version: 5 updated: 2015/04/26 18:06:58
+dnl CF_NCURSES_ADDON version: 6 updated: 2021/01/04 19:33:05
 dnl ----------------
 dnl Configure an ncurses add-on, built outside the ncurses tree.
 AC_DEFUN([CF_NCURSES_ADDON],[
@@ -2117,7 +2848,7 @@ CF_EOF
                cf_try="$ac_cpp conftest.$ac_ext 2>&5 | fgrep AUTOCONF_$cf_name >conftest.out"
                AC_TRY_EVAL(cf_try)
                if test -f conftest.out ; then
-                       cf_result=`cat conftest.out | sed -e "s/^.*AUTOCONF_$cf_name[[  ]][[    ]]*//"`
+                       cf_result=`sed -e "s/^.*AUTOCONF_${cf_name}[[   ]][[    ]]*//" conftest.out`
                        eval NCURSES_$cf_name=\"$cf_result\"
                        # cat conftest.$ac_ext
                        # cat conftest.out
@@ -2151,7 +2882,7 @@ AC_SUBST(cf_cv_type_of_bool)dnl
 
 ])
 dnl ---------------------------------------------------------------------------
-dnl CF_NCURSES_CC_CHECK version: 4 updated: 2007/07/29 10:39:05
+dnl CF_NCURSES_CC_CHECK version: 5 updated: 2020/12/31 20:19:42
 dnl -------------------
 dnl Check if we can compile with ncurses' header file
 dnl $1 is the cache variable to set
@@ -2171,10 +2902,10 @@ AC_DEFUN([CF_NCURSES_CC_CHECK],[
        make an error
 #endif
 ])[
-printf("%s\n", NCURSES_VERSION);
+printf("%s\\n", NCURSES_VERSION);
 #else
 #ifdef __NCURSES_H
-printf("old\n");
+printf("old\\n");
 #else
        make an error
 #endif
@@ -2184,7 +2915,7 @@ printf("old\n");
        ,[$1=no])
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_NCURSES_CONFIG version: 17 updated: 2015/07/07 04:22:07
+dnl CF_NCURSES_CONFIG version: 28 updated: 2021/08/28 15:20:37
 dnl -----------------
 dnl Tie together the configure-script macros for ncurses, preferring these in
 dnl order:
@@ -2206,17 +2937,53 @@ if test "x${PKG_CONFIG:=none}" != xnone; then
                AC_MSG_CHECKING(if the $cf_ncuconfig_root package files work)
                cf_have_ncuconfig=unknown
 
+               cf_save_CFLAGS="$CFLAGS"
                cf_save_CPPFLAGS="$CPPFLAGS"
                cf_save_LIBS="$LIBS"
 
-               CPPFLAGS="$CPPFLAGS `$PKG_CONFIG --cflags $cf_ncuconfig_root`"
-               CF_ADD_LIBS(`$PKG_CONFIG --libs $cf_ncuconfig_root`)
+               cf_pkg_cflags="`$PKG_CONFIG --cflags $cf_ncuconfig_root`"
+               cf_pkg_libs="`$PKG_CONFIG --libs $cf_ncuconfig_root`"
+
+               # while -W for passing linker flags is prevalent, it is not "standard".
+               # At least one wrapper for c89/c99 (in Apple's xcode) has its own
+               # incompatible _and_ non-standard -W option which gives an error.  Work
+               # around that pitfall.
+               case "x${CC}@@${cf_pkg_libs}@${cf_pkg_cflags}" in
+               (x*c[[89]]9@@*-W*)
+                       CF_ADD_CFLAGS($cf_pkg_cflags)
+                       CF_ADD_LIBS($cf_pkg_libs)
+
+                       AC_TRY_LINK([#include <${cf_cv_ncurses_header:-curses.h}>],
+                               [initscr(); mousemask(0,0); tigetstr((char *)0);],
+                               [AC_TRY_RUN([#include <${cf_cv_ncurses_header:-curses.h}>
+                                       int main(void)
+                                       { const char *xx = curses_version(); return (xx == 0); }],
+                                       [cf_test_ncuconfig=yes],
+                                       [cf_test_ncuconfig=no],
+                                       [cf_test_ncuconfig=maybe])],
+                               [cf_test_ncuconfig=no])
+
+                       CFLAGS="$cf_save_CFLAGS"
+                       CPPFLAGS="$cf_save_CPPFLAGS"
+                       LIBS="$cf_save_LIBS"
+
+                       if test "x$cf_test_ncuconfig" != xyes; then
+                               cf_temp=`echo "x$cf_pkg_cflags" | sed -e s/^x// -e 's/-W[[^     ]]*//g'`
+                               cf_pkg_cflags="$cf_temp"
+                               cf_temp=`echo "x$cf_pkg_libs" | sed -e s/^x// -e 's/-W[[^       ]]*//g'`
+                               cf_pkg_libs="$cf_temp"
+                       fi
+                       ;;
+               esac
+
+               CF_APPEND_CFLAGS($cf_pkg_cflags)
+               CF_ADD_LIBS($cf_pkg_libs)
 
                AC_TRY_LINK([#include <${cf_cv_ncurses_header:-curses.h}>],
-                       [initscr(); mousemask(0,0); tgoto((char *)0, 0, 0);],
+                       [initscr(); mousemask(0,0); tigetstr((char *)0);],
                        [AC_TRY_RUN([#include <${cf_cv_ncurses_header:-curses.h}>
                                int main(void)
-                               { char *xx = curses_version(); return (xx == 0); }],
+                               { const char *xx = curses_version(); return (xx == 0); }],
                                [cf_have_ncuconfig=yes],
                                [cf_have_ncuconfig=no],
                                [cf_have_ncuconfig=maybe])],
@@ -2231,6 +2998,7 @@ if test "x${PKG_CONFIG:=none}" != xnone; then
                else
                        AC_DEFINE(NCURSES,1,[Define to 1 if we are using ncurses headers/libraries])
                        NCURSES_CONFIG_PKG=$cf_ncuconfig_root
+                       CF_TERM_HEADER
                fi
 
        else
@@ -2242,15 +3010,15 @@ else
 fi
 
 if test "x$cf_have_ncuconfig" = "xno"; then
-       echo "Looking for ${cf_ncuconfig_root}-config"
+       cf_ncurses_config="${cf_ncuconfig_root}${NCURSES_CONFIG_SUFFIX}-config"; echo "Looking for ${cf_ncurses_config}"
 
        CF_ACVERSION_CHECK(2.52,
-               [AC_CHECK_TOOLS(NCURSES_CONFIG, ${cf_ncuconfig_root}-config ${cf_ncuconfig_root}6-config ${cf_ncuconfig_root}5-config, none)],
-               [AC_PATH_PROGS(NCURSES_CONFIG,  ${cf_ncuconfig_root}-config ${cf_ncuconfig_root}6-config ${cf_ncuconfig_root}5-config, none)])
+               [AC_CHECK_TOOLS(NCURSES_CONFIG, ${cf_ncurses_config} ${cf_ncuconfig_root}6-config ${cf_ncuconfig_root}6-config ${cf_ncuconfig_root}5-config, none)],
+               [AC_PATH_PROGS(NCURSES_CONFIG,  ${cf_ncurses_config} ${cf_ncuconfig_root}6-config ${cf_ncuconfig_root}6-config ${cf_ncuconfig_root}5-config, none)])
 
        if test "$NCURSES_CONFIG" != none ; then
 
-               CPPFLAGS="$CPPFLAGS `$NCURSES_CONFIG --cflags`"
+               CF_APPEND_CFLAGS(`$NCURSES_CONFIG --cflags`)
                CF_ADD_LIBS(`$NCURSES_CONFIG --libs`)
 
                # even with config script, some packages use no-override for curses.h
@@ -2264,7 +3032,7 @@ if test "x$cf_have_ncuconfig" = "xno"; then
                AC_DEFINE_UNQUOTED($cf_nculib_ROOT)
 
                dnl like CF_NCURSES_VERSION
-               cf_cv_ncurses_version=`$NCURSES_CONFIG --version`
+               cf_cv_ncurses_version="`$NCURSES_CONFIG --version`"
 
        else
 
@@ -2277,7 +3045,7 @@ else
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_NCURSES_CPPFLAGS version: 21 updated: 2012/10/06 08:57:51
+dnl CF_NCURSES_CPPFLAGS version: 22 updated: 2021/01/02 09:31:20
 dnl -------------------
 dnl Look for the SVr4 curses clone 'ncurses' in the standard places, adjusting
 dnl the CPPFLAGS variable so we can include its header.
@@ -2311,7 +3079,7 @@ test "$cf_cv_curses_dir" != "no" && { \
 
 AC_CACHE_CHECK(for $cf_ncuhdr_root header in include-path, cf_cv_ncurses_h,[
        cf_header_list="$cf_ncuhdr_root/curses.h $cf_ncuhdr_root/ncurses.h"
-       ( test "$cf_ncuhdr_root" = ncurses || test "$cf_ncuhdr_root" = ncursesw ) && cf_header_list="$cf_header_list curses.h ncurses.h"
+       { test "$cf_ncuhdr_root" = ncurses || test "$cf_ncuhdr_root" = ncursesw; } && cf_header_list="$cf_header_list curses.h ncurses.h"
        for cf_header in $cf_header_list
        do
                CF_NCURSES_CC_CHECK(cf_cv_ncurses_h,$cf_header,$1)
@@ -2328,7 +3096,7 @@ AC_DEFINE(NCURSES,1,[Define to 1 if we are using ncurses headers/libraries])
 CF_NCURSES_VERSION
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_NCURSES_HEADER version: 4 updated: 2015/04/15 19:08:48
+dnl CF_NCURSES_HEADER version: 7 updated: 2021/01/04 19:33:05
 dnl -----------------
 dnl Find a "curses" header file, e.g,. "curses.h", or one of the more common
 dnl variations of ncurses' installs.
@@ -2343,7 +3111,7 @@ else
 AC_CACHE_CHECK(for $cf_ncuhdr_root include-path, cf_cv_ncurses_h2,[
        test -n "$verbose" && echo
        CF_HEADER_PATH(cf_search,$cf_ncuhdr_root)
-       test -n "$verbose" && echo search path $cf_search
+       test -n "$verbose" && echo "search path $cf_search"
        cf_save2_CPPFLAGS="$CPPFLAGS"
        for cf_incdir in $cf_search
        do
@@ -2355,7 +3123,7 @@ AC_CACHE_CHECK(for $cf_ncuhdr_root include-path, cf_cv_ncurses_h2,[
                        CF_NCURSES_CC_CHECK(cf_cv_ncurses_h2,$cf_header,$1)
                        if test "$cf_cv_ncurses_h2" != no ; then
                                cf_cv_ncurses_h2=$cf_incdir/$cf_header
-                               test -n "$verbose" && echo $ac_n "      ... found $ac_c" 1>&AC_FD_MSG
+                               test -n "$verbose" && echo $ECHO_N "    ... found $ECHO_C" 1>&AC_FD_MSG
                                break
                        fi
                        test -n "$verbose" && echo "    ... tested $cf_incdir/$cf_header" 1>&AC_FD_MSG
@@ -2367,9 +3135,9 @@ AC_CACHE_CHECK(for $cf_ncuhdr_root include-path, cf_cv_ncurses_h2,[
        ])
 
        CF_DIRNAME(cf_1st_incdir,$cf_cv_ncurses_h2)
-       cf_cv_ncurses_header=`basename $cf_cv_ncurses_h2`
-       if test `basename $cf_1st_incdir` = $cf_ncuhdr_root ; then
-               cf_cv_ncurses_header=$cf_ncuhdr_root/$cf_cv_ncurses_header
+       cf_cv_ncurses_header="`basename "$cf_cv_ncurses_h2"`"
+       if test "`basename "$cf_1st_incdir"`" = "$cf_ncuhdr_root" ; then
+               cf_cv_ncurses_header="$cf_ncuhdr_root/$cf_cv_ncurses_header"
        fi
        CF_ADD_INCDIR($cf_1st_incdir)
 
@@ -2377,13 +3145,13 @@ fi
 
 # Set definitions to allow ifdef'ing for ncurses.h
 
-case $cf_cv_ncurses_header in
+case "$cf_cv_ncurses_header" in
 (*ncurses.h)
        AC_DEFINE(HAVE_NCURSES_H,1,[Define to 1 if we have ncurses.h])
        ;;
 esac
 
-case $cf_cv_ncurses_header in
+case "$cf_cv_ncurses_header" in
 (ncurses/curses.h|ncurses/ncurses.h)
        AC_DEFINE(HAVE_NCURSES_NCURSES_H,1,[Define to 1 if we have ncurses/ncurses.h])
        ;;
@@ -2394,7 +3162,7 @@ esac
 
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_NCURSES_LIBS version: 17 updated: 2015/04/15 19:08:48
+dnl CF_NCURSES_LIBS version: 21 updated: 2021/09/04 06:37:12
 dnl ---------------
 dnl Look for the ncurses library.  This is a little complicated on Linux,
 dnl because it may be linked with the gpm (general purpose mouse) library.
@@ -2420,10 +3188,10 @@ AC_CHECK_LIB(gpm,Gpm_Open,
                [LIBS="$cf_ncurses_SAVE"],
                [cf_ncurses_LIBS="-lgpm"])])
 
-case $host_os in
+case "$host_os" in
 (freebsd*)
        # This is only necessary if you are linking against an obsolete
-       # version of ncurses (but it should do no harm, since it's static).
+       # version of ncurses (but it should do no harm, since it is static).
        if test "$cf_nculib_root" = ncurses ; then
                AC_CHECK_LIB(mytinfo,tgoto,[cf_ncurses_LIBS="-lmytinfo $cf_ncurses_LIBS"])
        fi
@@ -2432,7 +3200,7 @@ esac
 
 CF_ADD_LIBS($cf_ncurses_LIBS)
 
-if ( test -n "$cf_cv_curses_dir" && test "$cf_cv_curses_dir" != "no" )
+if test -n "$cf_cv_curses_dir" && test "$cf_cv_curses_dir" != "no"
 then
        CF_ADD_LIBS(-l$cf_nculib_root)
 else
@@ -2446,13 +3214,13 @@ if test -n "$cf_ncurses_LIBS" ; then
        AC_MSG_CHECKING(if we can link $cf_nculib_root without $cf_ncurses_LIBS)
        cf_ncurses_SAVE="$LIBS"
        for p in $cf_ncurses_LIBS ; do
-               q=`echo $LIBS | sed -e "s%$p %%" -e "s%$p$%%"`
+               q=`echo "$LIBS" | sed -e "s%$p %%" -e "s%$p$%%"`
                if test "$q" != "$LIBS" ; then
                        LIBS="$q"
                fi
        done
        AC_TRY_LINK([#include <${cf_cv_ncurses_header:-curses.h}>],
-               [initscr(); mousemask(0,0); tgoto((char *)0, 0, 0);],
+               [initscr(); mousemask(0,0); tigetstr((char *)0);],
                [AC_MSG_RESULT(yes)],
                [AC_MSG_RESULT(no)
                 LIBS="$cf_ncurses_SAVE"])
@@ -2462,7 +3230,7 @@ CF_UPPER(cf_nculib_ROOT,HAVE_LIB$cf_nculib_root)
 AC_DEFINE_UNQUOTED($cf_nculib_ROOT)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_NCURSES_VERSION version: 14 updated: 2012/10/06 08:57:51
+dnl CF_NCURSES_VERSION version: 16 updated: 2020/12/31 20:19:42
 dnl ------------------
 dnl Check for the version of ncurses, to aid in reporting bugs, etc.
 dnl Call CF_CURSES_CPPFLAGS first, or CF_NCURSES_CPPFLAGS.  We don't use
@@ -2473,22 +3241,22 @@ AC_REQUIRE([CF_CURSES_CPPFLAGS])dnl
 AC_CACHE_CHECK(for ncurses version, cf_cv_ncurses_version,[
        cf_cv_ncurses_version=no
        cf_tempfile=out$$
-       rm -f $cf_tempfile
+       rm -f "$cf_tempfile"
        AC_TRY_RUN([
 #include <${cf_cv_ncurses_header:-curses.h}>
 #include <stdio.h>
-int main()
+int main(void)
 {
        FILE *fp = fopen("$cf_tempfile", "w");
 #ifdef NCURSES_VERSION
 # ifdef NCURSES_VERSION_PATCH
-       fprintf(fp, "%s.%d\n", NCURSES_VERSION, NCURSES_VERSION_PATCH);
+       fprintf(fp, "%s.%d\\n", NCURSES_VERSION, NCURSES_VERSION_PATCH);
 # else
-       fprintf(fp, "%s\n", NCURSES_VERSION);
+       fprintf(fp, "%s\\n", NCURSES_VERSION);
 # endif
 #else
 # ifdef __NCURSES_H
-       fprintf(fp, "old\n");
+       fprintf(fp, "old\\n");
 # else
        make an error
 # endif
@@ -2499,7 +3267,7 @@ int main()
 
        # This will not work if the preprocessor splits the line after the
        # Autoconf token.  The 'unproto' program does that.
-       cat > conftest.$ac_ext <<EOF
+       cat > "conftest.$ac_ext" <<EOF
 #include <${cf_cv_ncurses_header:-curses.h}>
 #undef Autoconf
 #ifdef NCURSES_VERSION
@@ -2514,17 +3282,17 @@ EOF
        cf_try="$ac_cpp conftest.$ac_ext 2>&AC_FD_CC | grep '^Autoconf ' >conftest.out"
        AC_TRY_EVAL(cf_try)
        if test -f conftest.out ; then
-               cf_out=`cat conftest.out | sed -e 's%^Autoconf %%' -e 's%^[[^"]]*"%%' -e 's%".*%%'`
+               cf_out=`sed -e 's%^Autoconf %%' -e 's%^[[^"]]*"%%' -e 's%".*%%' conftest.out`
                test -n "$cf_out" && cf_cv_ncurses_version="$cf_out"
                rm -f conftest.out
        fi
 ])
-       rm -f $cf_tempfile
+       rm -f "$cf_tempfile"
 ])
 test "$cf_cv_ncurses_version" = no || AC_DEFINE(NCURSES,1,[Define to 1 if we are using ncurses headers/libraries])
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_OBJ_SUBDIR version: 7 updated: 2015/04/17 21:13:04
+dnl CF_OBJ_SUBDIR version: 8 updated: 2021/01/01 13:31:04
 dnl -------------
 dnl Compute the object-directory name from the given model name
 AC_DEFUN([CF_OBJ_SUBDIR],
@@ -2535,7 +3303,7 @@ AC_DEFUN([CF_OBJ_SUBDIR],
        (debug)   $2='obj_g' ;;
        (profile) $2='obj_p' ;;
        (shared)
-               case $cf_cv_system_name in
+               case "$cf_cv_system_name" in
                (cygwin|msys)
                        $2='objects' ;;
                (*)
@@ -2544,14 +3312,14 @@ AC_DEFUN([CF_OBJ_SUBDIR],
        esac
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_PATHSEP version: 7 updated: 2015/04/12 15:39:00
+dnl CF_PATHSEP version: 8 updated: 2021/01/01 13:31:04
 dnl ----------
 dnl Provide a value for the $PATH and similar separator (or amend the value
 dnl as provided in autoconf 2.5x).
 AC_DEFUN([CF_PATHSEP],
 [
        AC_MSG_CHECKING(for PATH separator)
-       case $cf_cv_system_name in
+       case "$cf_cv_system_name" in
        (os2*)  PATH_SEPARATOR=';'  ;;
        (*)     ${PATH_SEPARATOR:=':'}  ;;
        esac
@@ -2560,7 +3328,7 @@ ifelse([$1],,,[$1=$PATH_SEPARATOR])
        AC_MSG_RESULT($PATH_SEPARATOR)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_PATH_SYNTAX version: 16 updated: 2015/04/18 08:56:57
+dnl CF_PATH_SYNTAX version: 18 updated: 2020/12/31 18:40:20
 dnl --------------
 dnl Check the argument to see that it looks like a pathname.  Rewrite it if it
 dnl begins with one of the prefix/exec_prefix variables, and then again if the
@@ -2580,16 +3348,16 @@ case ".[$]$1" in
        ;;
 (.[[a-zA-Z]]:[[\\/]]*) # OS/2 EMX
        ;;
-(.\[$]{*prefix}*|.\[$]{*dir}*)
+(.\[$]\{*prefix\}*|.\[$]\{*dir\}*)
        eval $1="[$]$1"
        case ".[$]$1" in
        (.NONE/*)
-               $1=`echo [$]$1 | sed -e s%NONE%$cf_path_syntax%`
+               $1=`echo "[$]$1" | sed -e s%NONE%$cf_path_syntax%`
                ;;
        esac
        ;;
 (.no|.NONE/*)
-       $1=`echo [$]$1 | sed -e s%NONE%$cf_path_syntax%`
+       $1=`echo "[$]$1" | sed -e s%NONE%$cf_path_syntax%`
        ;;
 (*)
        ifelse([$2],,[AC_MSG_ERROR([expected a pathname, not \"[$]$1\"])],$2)
@@ -2597,9 +3365,11 @@ case ".[$]$1" in
 esac
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_PKG_CONFIG version: 10 updated: 2015/04/26 18:06:58
+dnl CF_PKG_CONFIG version: 12 updated: 2021/10/10 20:18:09
 dnl -------------
 dnl Check for the package-config program, unless disabled by command-line.
+dnl
+dnl Sets $PKG_CONFIG to the pathname of the pkg-config program.
 AC_DEFUN([CF_PKG_CONFIG],
 [
 AC_MSG_CHECKING(if you want to use pkg-config)
@@ -2609,7 +3379,7 @@ AC_ARG_WITH(pkg-config,
        [cf_pkg_config=yes])
 AC_MSG_RESULT($cf_pkg_config)
 
-case $cf_pkg_config in
+case "$cf_pkg_config" in
 (no)
        PKG_CONFIG=none
        ;;
@@ -2633,7 +3403,7 @@ fi
 AC_SUBST(PKG_CONFIG)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_POSIX_C_SOURCE version: 9 updated: 2015/04/12 15:39:00
+dnl CF_POSIX_C_SOURCE version: 11 updated: 2018/12/31 20:46:17
 dnl -----------------
 dnl Define _POSIX_C_SOURCE to the given level, and _POSIX_SOURCE if needed.
 dnl
@@ -2648,7 +3418,10 @@ dnl
 dnl Parameters:
 dnl    $1 is the nominal value for _POSIX_C_SOURCE
 AC_DEFUN([CF_POSIX_C_SOURCE],
-[
+[AC_REQUIRE([CF_POSIX_VISIBLE])dnl
+
+if test "$cf_cv_posix_visible" = no; then
+
 cf_POSIX_C_SOURCE=ifelse([$1],,199506L,[$1])
 
 cf_save_CFLAGS="$CFLAGS"
@@ -2686,7 +3459,8 @@ make an error
         fi
         CF_MSG_LOG(ifdef from value $cf_POSIX_C_SOURCE)
         CFLAGS="$cf_trim_CFLAGS"
-        CPPFLAGS="$cf_trim_CPPFLAGS $cf_cv_posix_c_source"
+        CPPFLAGS="$cf_trim_CPPFLAGS"
+        CF_APPEND_TEXT(CPPFLAGS,$cf_cv_posix_c_source)
         CF_MSG_LOG(if the second compile does not leave our definition intact error)
         AC_TRY_COMPILE([#include <sys/types.h>],[
 #ifndef _POSIX_C_SOURCE
@@ -2704,6 +3478,35 @@ if test "$cf_cv_posix_c_source" != no ; then
        CF_ADD_CFLAGS($cf_cv_posix_c_source)
 fi
 
+fi # cf_cv_posix_visible
+
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_POSIX_VISIBLE version: 1 updated: 2018/12/31 20:46:17
+dnl ----------------
+dnl POSIX documents test-macros which an application may set before any system
+dnl headers are included to make features available.
+dnl
+dnl Some BSD platforms (originally FreeBSD, but copied by a few others)
+dnl diverged from POSIX in 2002 by setting symbols which make all of the most
+dnl recent features visible in the system header files unless the application
+dnl overrides the corresponding test-macros.  Doing that introduces portability
+dnl problems.
+dnl
+dnl This macro makes a special check for the symbols used for this, to avoid a
+dnl conflicting definition.
+AC_DEFUN([CF_POSIX_VISIBLE],
+[
+AC_CACHE_CHECK(if the POSIX test-macros are already defined,cf_cv_posix_visible,[
+AC_TRY_COMPILE([#include <stdio.h>],[
+#if defined(__POSIX_VISIBLE) && ((__POSIX_VISIBLE - 0L) > 0) \
+       && defined(__XSI_VISIBLE) && ((__XSI_VISIBLE - 0L) > 0) \
+       && defined(__BSD_VISIBLE) && ((__BSD_VISIBLE - 0L) > 0) \
+       && defined(__ISO_C_VISIBLE) && ((__ISO_C_VISIBLE - 0L) > 0)
+#error conflicting symbols found
+#endif
+],[cf_cv_posix_visible=no],[cf_cv_posix_visible=yes])
+])
 ])dnl
 dnl ---------------------------------------------------------------------------
 dnl CF_PROG_AR version: 1 updated: 2009/01/01 20:15:22
@@ -2722,11 +3525,15 @@ AC_PROG_AWK
 test -z "$AWK" && AC_MSG_ERROR(No awk program found)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_PROG_CC version: 4 updated: 2014/07/12 18:57:58
+dnl CF_PROG_CC version: 5 updated: 2019/12/31 08:53:54
 dnl ----------
 dnl standard check for CC, plus followup sanity checks
 dnl $1 = optional parameter to pass to AC_PROG_CC to specify compiler name
 AC_DEFUN([CF_PROG_CC],[
+CF_ACVERSION_CHECK(2.53,
+       [AC_MSG_WARN(this will incorrectly handle gnatgcc choice)
+        AC_REQUIRE([AC_PROG_CC])],
+       [])
 ifelse($1,,[AC_PROG_CC],[AC_PROG_CC($1)])
 CF_GCC_VERSION
 CF_ACVERSION_CHECK(2.52,
@@ -2735,7 +3542,7 @@ CF_ACVERSION_CHECK(2.52,
 CF_CC_ENV_FLAGS
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_PROG_CC_C_O version: 4 updated: 2016/05/21 18:08:09
+dnl CF_PROG_CC_C_O version: 6 updated: 2021/01/01 13:31:04
 dnl --------------
 dnl Analogous to AC_PROG_CC_C_O, but more useful: tests only $CC, ensures that
 dnl the output file can be renamed, and allows for a shell variable that can
@@ -2752,7 +3559,7 @@ AC_MSG_CHECKING([whether [$]$1 understands -c and -o together])
 AC_CACHE_VAL(cf_cv_prog_$1_c_o,
 [
 cat > conftest.$ac_ext <<CF_EOF
-int main()
+int main(void)
 {
        ${cf_cv_main_return:-return}(0);
 }
@@ -2767,9 +3574,9 @@ then
 else
   eval cf_cv_prog_$1_c_o=no
 fi
-rm -rf conftest*
+rm -rf ./conftest*
 ])dnl
-if test $cf_cv_prog_$1_c_o = yes; then
+if test "$cf_cv_prog_$1_c_o" = yes; then
   AC_MSG_RESULT([yes])
 else
   AC_MSG_RESULT([no])
@@ -2791,16 +3598,16 @@ AC_DEFUN([CF_PROG_EGREP],
        test -z "$EGREP" && AC_MSG_ERROR(No egrep program found)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_PROG_EXT version: 13 updated: 2015/04/18 09:03:58
+dnl CF_PROG_EXT version: 15 updated: 2021/01/02 09:31:20
 dnl -----------
 dnl Compute $PROG_EXT, used for non-Unix ports, such as OS/2 EMX.
 AC_DEFUN([CF_PROG_EXT],
 [
 AC_REQUIRE([CF_CHECK_CACHE])
-case $cf_cv_system_name in
+case "$cf_cv_system_name" in
 (os2*)
        CFLAGS="$CFLAGS -Zmt"
-       CPPFLAGS="$CPPFLAGS -D__ST_MT_ERRNO__"
+       CF_APPEND_TEXT(CPPFLAGS,-D__ST_MT_ERRNO__)
        CXXFLAGS="$CXXFLAGS -Zmt"
        # autoconf's macro sets -Zexe and suffix both, which conflict:w
        LDFLAGS="$LDFLAGS -Zmt -Zcrtdll"
@@ -2816,25 +3623,88 @@ AC_SUBST(PROG_EXT)
 test -n "$PROG_EXT" && AC_DEFINE_UNQUOTED(PROG_EXT,"$PROG_EXT",[Define to the program extension (normally blank)])
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_PROG_GNAT version: 3 updated: 2015/04/18 08:56:57
+dnl CF_PROG_GNAT version: 12 updated: 2021/01/02 17:09:14
 dnl ------------
-dnl Check for gnatmake, ensure that it is complete.
+dnl Check for gnat/gnatmake/etc, ensure that the toolset is complete.
 AC_DEFUN([CF_PROG_GNAT],[
-cf_ada_make=gnatmake
-AC_CHECK_PROG(gnat_exists, $cf_ada_make, yes, no)
-if test "$ac_cv_prog_gnat_exists" = no; then
+for cf_prog_gnat in gnat gnatmake gprconfig gprbuild
+do
+       CF_UPPER(cf_upper_prog_gnat,${cf_prog_gnat})
+
+       unset ac_cv_path_cf_TEMP_gnat
+       unset cf_TEMP_gnat
+       AC_PATH_PROG(cf_TEMP_gnat,$cf_prog_gnat,no)
+       eval "cf_cv_PATH_$cf_upper_prog_gnat=[$]ac_cv_path_cf_TEMP_gnat"
+
+       if test "x$cf_TEMP_gnat" != xno; then
+               unset cf_cv_gnat_version
+               unset cf_TEMP_gnat
+               CF_GNAT_VERSION(cf_TEMP_gnat,$cf_prog_gnat)
+       fi
+       eval "cf_cv_VERSION_$cf_upper_prog_gnat=[$]cf_TEMP_gnat"
+
+       unset cf_TEMP_gnat
+       unset cf_cv_gnat_version
+       unset ac_cv_path_cf_TEMP_gnat
+done
+
+if test "x$cf_cv_VERSION_GNATMAKE" = "xno"; then
        cf_ada_make=
        cf_cv_prog_gnat_correct=no
 else
-       CF_GNAT_VERSION
-       AC_CHECK_PROG(M4_exists, m4, yes, no)
-       if test "$ac_cv_prog_M4_exists" = no; then
-               cf_cv_prog_gnat_correct=no
-               echo Ada95 binding required program m4 not found. Ada95 binding disabled.
+       cf_ada_make=gnatmake
+       if test "x$cf_cv_VERSION_GPRCONFIG" = "xno"; then
+               # gprconfig is newer than gnatmake; we can continue...
+               cf_ada_config="##"
+       else
+               rm -rf ./conftest* ./*~conftest*
+               if mkdir conftest.src
+               then
+                       cf_ada_config=""
+                       cd conftest.src
+                       for cf_gprconfig in Ada C
+                       do
+                               AC_MSG_CHECKING(for gprconfig name for $cf_gprconfig)
+                               if test "$cf_gprconfig" = C
+                               then
+                                       for cf_gprconfig_param in \
+                                               "$cf_gprconfig,,,,GNATGCC" \
+                                               "$cf_gprconfig,,,,GCC" \
+                                               "$cf_gprconfig"
+                                       do
+                                               cf_gprconfig_value=`echo s| gprconfig --config=$cf_gprconfig_param 2>&AC_FD_CC | ${AWK:-awk} '/^\*/{print [$]3;}' | head -n 1`
+                                               test -n "$cf_gprconfig_value" && break
+                                       done
+                               else
+                                       cf_gprconfig_param=$cf_gprconfig
+                                       cf_gprconfig_value=`echo s| gprconfig --config=$cf_gprconfig_param 2>&AC_FD_CC | ${AWK:-awk} '/^\*/{print [$]3;}' | head -n 1`
+                               fi
+                               if test -n "$cf_gprconfig_value"
+                               then
+                                       eval "cf_ada_config_[$]cf_gprconfig=[$]cf_gprconfig_value"
+                                       AC_MSG_RESULT($cf_gprconfig_value)
+                               else
+                                       AC_MSG_RESULT(missing)
+                                       cf_ada_config="#"
+                                       break
+                               fi
+                       done
+                       cd ..
+                       rm -rf ./conftest* ./*~conftest*
+               fi
        fi
-       if test "$cf_cv_prog_gnat_correct" = yes; then
-               AC_MSG_CHECKING(if GNAT works)
-               CF_GNAT_TRY_RUN([procedure conftest;],
+       if test "x$cf_ada_config" != "x#"
+       then
+               CF_GNAT_VERSION
+               CF_CHECK_GNAT_VERSION
+               AC_CHECK_PROG(M4_exists, m4, yes, no)
+               if test "$ac_cv_prog_M4_exists" = no; then
+                       cf_cv_prog_gnat_correct=no
+                       AC_MSG_WARN(Ada95 binding required program m4 not found. Ada95 binding disabled)
+               fi
+               if test "$cf_cv_prog_gnat_correct" = yes; then
+                       AC_MSG_CHECKING(if GNAT works)
+                       CF_GNAT_TRY_RUN([procedure conftest;],
 [with Text_IO;
 with GNAT.OS_Lib;
 procedure conftest is
@@ -2842,12 +3712,38 @@ begin
    Text_IO.Put ("Hello World");
    Text_IO.New_Line;
    GNAT.OS_Lib.OS_Exit (0);
-end conftest;],[cf_cv_prog_gnat_correct=yes],[cf_cv_prog_gnat_correct=no])
-               AC_MSG_RESULT($cf_cv_prog_gnat_correct)
+end conftest;],
+[cf_cv_prog_gnat_correct=yes],
+[cf_cv_prog_gnat_correct=no])
+                       AC_MSG_RESULT($cf_cv_prog_gnat_correct)
+               fi
+       else
+               cf_cv_prog_gnat_correct=no
        fi
 fi
 
 AC_SUBST(cf_ada_make)
+AC_SUBST(cf_ada_config)
+AC_SUBST(cf_ada_config_Ada)
+AC_SUBST(cf_ada_config_C)
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_PROG_INSTALL version: 10 updated: 2021/01/04 19:33:05
+dnl ---------------
+dnl Force $INSTALL to be an absolute-path.  Otherwise, edit_man.sh and the
+dnl misc/tabset install won't work properly.  Usually this happens only when
+dnl using the fallback mkinstalldirs script
+AC_DEFUN([CF_PROG_INSTALL],
+[AC_PROG_INSTALL
+case $INSTALL in
+(/*)
+       ;;
+(*)
+       CF_DIRNAME(cf_dir,$INSTALL)
+       test -z "$cf_dir" && cf_dir=.
+       INSTALL="`cd \"$cf_dir\" && pwd`"/"`echo "$INSTALL" | sed -e 's%^.*/%%'`"
+       ;;
+esac
 ])dnl
 dnl ---------------------------------------------------------------------------
 dnl CF_PROG_LN_S version: 2 updated: 2010/08/14 18:25:37
@@ -2872,6 +3768,24 @@ AC_MSG_RESULT($cf_prog_ln_sf)
 test "$cf_prog_ln_sf" = yes && LN_S="$LN_S -f"
 ])dnl
 dnl ---------------------------------------------------------------------------
+dnl CF_REMOVE_CFLAGS version: 3 updated: 2021/09/05 17:25:40
+dnl ----------------
+dnl Remove a given option from CFLAGS/CPPFLAGS
+dnl $1 = option to remove
+dnl $2 = variable to update
+dnl $3 = nonempty to allow verbose message
+define([CF_REMOVE_CFLAGS],
+[
+cf_tmp_cflag=`echo "x$1" | sed -e 's/^.//' -e 's/=.*//'`
+while true
+do
+       cf_old_cflag=`echo "x[$]$2" | sed -e 's/^.//' -e 's/[[  ]][[    ]]*-/ -/g' -e "s%$cf_tmp_cflag\\(=[[^   ]][[^   ]]*\\)\?%%" -e 's/^[[   ]]*//' -e 's%[[ ]][[ ]]*-D% -D%g' -e 's%[[ ]][[ ]]*-I% -I%g'`
+       test "[$]$2" != "$cf_old_cflag" || break
+       ifelse([$3],,,[CF_VERBOSE(removing old option $1 from $2)])
+       $2="$cf_old_cflag"
+done
+])dnl
+dnl ---------------------------------------------------------------------------
 dnl CF_REMOVE_DEFINE version: 3 updated: 2010/01/09 11:05:50
 dnl ----------------
 dnl Remove all -U and -D options that refer to the given symbol from a list
@@ -2902,7 +3816,43 @@ define([CF_REMOVE_LIB],
 $1=`echo "$2" | sed -e 's/-l$3[[       ]]//g' -e 's/-l$3[$]//'`
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_SHARED_OPTS version: 89 updated: 2015/08/15 18:38:59
+dnl CF_RESTORE_XTRA_FLAGS version: 1 updated: 2020/01/11 16:47:45
+dnl ---------------------
+dnl Restore flags saved in CF_SAVE_XTRA_FLAGS
+dnl $1 = name of current macro
+define([CF_RESTORE_XTRA_FLAGS],
+[
+LIBS="$cf_save_LIBS_$1"
+CFLAGS="$cf_save_CFLAGS_$1"
+CPPFLAGS="$cf_save_CPPFLAGS_$1"
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_SAVE_XTRA_FLAGS version: 1 updated: 2020/01/11 16:46:44
+dnl ------------------
+dnl Use this macro to save CFLAGS/CPPFLAGS/LIBS before checks against X headers
+dnl and libraries which do not update those variables.
+dnl
+dnl $1 = name of current macro
+define([CF_SAVE_XTRA_FLAGS],
+[
+cf_save_LIBS_$1="$LIBS"
+cf_save_CFLAGS_$1="$CFLAGS"
+cf_save_CPPFLAGS_$1="$CPPFLAGS"
+LIBS="$LIBS ${X_PRE_LIBS} ${X_LIBS} ${X_EXTRA_LIBS}"
+for cf_X_CFLAGS in $X_CFLAGS
+do
+       case "x$cf_X_CFLAGS" in
+       x-[[IUD]]*)
+               CPPFLAGS="$CPPFLAGS $cf_X_CFLAGS"
+               ;;
+       *)
+               CFLAGS="$CFLAGS $cf_X_CFLAGS"
+               ;;
+       esac
+done
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_SHARED_OPTS version: 107 updated: 2021/09/04 06:47:34
 dnl --------------
 dnl --------------
 dnl Attempt to determine the appropriate CC/LD options for creating a shared
@@ -2926,10 +3876,11 @@ dnl The variable 'cf_cv_shlib_version_infix' controls whether shared library
 dnl version numbers are infix (ex: libncurses.<ver>.dylib) or postfix
 dnl (ex: libncurses.so.<ver>).
 dnl
-dnl Some loaders leave 'so_locations' lying around.  It's nice to clean up.
+dnl Some loaders leave 'so_locations' lying around.  It is nice to clean up.
 AC_DEFUN([CF_SHARED_OPTS],
 [
        AC_REQUIRE([CF_LD_RPATH_OPT])
+
        RM_SHARED_OPTS=
        LOCAL_LDFLAGS=
        LOCAL_LDFLAGS2=
@@ -2951,7 +3902,7 @@ AC_DEFUN([CF_SHARED_OPTS],
        AC_ARG_WITH(shlib-version,
        [  --with-shlib-version=X  Specify rel or abi version for shared libs],
        [test -z "$withval" && withval=auto
-       case $withval in
+       case "$withval" in
        (yes)
                cf_cv_shlib_version=auto
                ;;
@@ -2971,7 +3922,20 @@ AC_DEFUN([CF_SHARED_OPTS],
 
        # Some less-capable ports of gcc support only -fpic
        CC_SHARED_OPTS=
+
+       cf_try_fPIC=no
        if test "$GCC" = yes
+       then
+               cf_try_fPIC=yes
+       else
+               case "$cf_cv_system_name" in
+               (*linux*)       # e.g., PGI compiler
+                       cf_try_fPIC=yes
+                       ;;
+               esac
+       fi
+
+       if test "$cf_try_fPIC" = yes
        then
                AC_MSG_CHECKING(which $CC option to use)
                cf_save_CFLAGS="$CFLAGS"
@@ -2986,19 +3950,19 @@ AC_DEFUN([CF_SHARED_OPTS],
 
        cf_cv_shlib_version_infix=no
 
-       case $cf_cv_system_name in
+       case "$cf_cv_system_name" in
        (aix4.[3-9]*|aix[[5-7]]*)
                if test "$GCC" = yes; then
                        CC_SHARED_OPTS='-Wl,-brtl'
-                       MK_SHARED_LIB='${CC} -shared -Wl,-brtl -Wl,-blibpath:${RPATH_LIST}:/usr/lib -o [$]@'
+                       MK_SHARED_LIB='${CC} ${LDFLAGS} ${CFLAGS} -shared -Wl,-brtl -Wl,-blibpath:${RPATH_LIST}:/usr/lib -o [$]@'
                else
                        CC_SHARED_OPTS='-brtl'
                        # as well as '-qpic=large -G' or perhaps "-bM:SRE -bnoentry -bexpall"
-                       MK_SHARED_LIB='${CC} -G -Wl,-brtl -Wl,-blibpath:${RPATH_LIST}:/usr/lib -o [$]@'
+                       MK_SHARED_LIB='${CC} ${LDFLAGS} ${CFLAGS} -G -Wl,-brtl -Wl,-blibpath:${RPATH_LIST}:/usr/lib -o [$]@'
                fi
                ;;
        (beos*)
-               MK_SHARED_LIB='${CC} ${CFLAGS} -o $[@] -Xlinker -soname=`basename $[@]` -nostart -e 0'
+               MK_SHARED_LIB='${CC} ${LDFLAGS} ${CFLAGS} -o $[@] -Xlinker -soname=`basename $[@]` -nostart -e 0'
                ;;
        (cygwin*)
                CC_SHARED_OPTS=
@@ -3018,7 +3982,7 @@ AC_DEFUN([CF_SHARED_OPTS],
                ** SHARED_LIB \[$]SHARED_LIB
                ** IMPORT_LIB \[$]IMPORT_LIB
 EOF
-               exec \[$]* -shared -Wl,--out-implib=\[$]{IMPORT_LIB} -Wl,--export-all-symbols -o \[$]{SHARED_LIB}
+               exec \[$]* ${LDFLAGS} -shared -Wl,--out-implib=\[$]{IMPORT_LIB} -Wl,--export-all-symbols -o \[$]{SHARED_LIB}
 CF_EOF
                chmod +x mk_shared_lib.sh
                ;;
@@ -3040,14 +4004,14 @@ CF_EOF
                ** SHARED_LIB \[$]SHARED_LIB
                ** IMPORT_LIB \[$]IMPORT_LIB
 EOF
-               exec \[$]* -shared -Wl,--out-implib=\[$]{IMPORT_LIB} -Wl,--export-all-symbols -o \[$]{SHARED_LIB}
+               exec \[$]* ${LDFLAGS} -shared -Wl,--out-implib=\[$]{IMPORT_LIB} -Wl,--export-all-symbols -o \[$]{SHARED_LIB}
 CF_EOF
                chmod +x mk_shared_lib.sh
                ;;
        (darwin*)
                cf_try_cflags="no-cpp-precomp"
                CC_SHARED_OPTS="-dynamic"
-               MK_SHARED_LIB='${CC} ${CFLAGS} -dynamiclib -install_name ${libdir}/`basename $[@]` -compatibility_version ${ABI_VERSION} -current_version ${ABI_VERSION} -o $[@]'
+               MK_SHARED_LIB='${CC} ${LDFLAGS} ${CFLAGS} -dynamiclib -install_name ${libdir}/`basename $[@]` -compatibility_version ${ABI_VERSION} -current_version ${ABI_VERSION} -o $[@]'
                test "$cf_cv_shlib_version" = auto && cf_cv_shlib_version=abi
                cf_cv_shlib_version_infix=yes
                AC_CACHE_CHECK([if ld -search_paths_first works], cf_cv_ldflags_search_paths_first, [
@@ -3055,16 +4019,20 @@ CF_EOF
                        LDFLAGS="$LDFLAGS -Wl,-search_paths_first"
                        AC_TRY_LINK(, [int i;], cf_cv_ldflags_search_paths_first=yes, cf_cv_ldflags_search_paths_first=no)
                                LDFLAGS=$cf_save_LDFLAGS])
-               if test $cf_cv_ldflags_search_paths_first = yes; then
+               if test "$cf_cv_ldflags_search_paths_first" = yes; then
                        LDFLAGS="$LDFLAGS -Wl,-search_paths_first"
                fi
                ;;
+       (haiku*)
+               CF_SHARED_SONAME
+               MK_SHARED_LIB='${CC} ${LDFLAGS} ${CFLAGS} -shared -Wl,-soname,'$cf_cv_shared_soname',-stats,-lc -o $[@]'
+               ;;
        (hpux[[7-8]]*)
                # HP-UX 8.07 ld lacks "+b" option used for libdir search-list
                if test "$GCC" != yes; then
                        CC_SHARED_OPTS='+Z'
                fi
-               MK_SHARED_LIB='${LD} -b -o $[@]'
+               MK_SHARED_LIB='${LD} ${LDFLAGS} -b -o $[@]'
                INSTALL_LIB="-m 555"
                ;;
        (hpux*)
@@ -3075,7 +4043,7 @@ CF_EOF
                        CC_SHARED_OPTS='+Z'
                        LD_SHARED_OPTS='-Wl,+b,${libdir}'
                fi
-               MK_SHARED_LIB='${LD} +b ${libdir} -b -o $[@]'
+               MK_SHARED_LIB='${LD} ${LDFLAGS} +b ${libdir} -b -o $[@]'
                # HP-UX shared libraries must be executable, and should be
                # readonly to exploit a quirk in the memory manager.
                INSTALL_LIB="-m 555"
@@ -3083,12 +4051,12 @@ CF_EOF
        (interix*)
                test "$cf_cv_shlib_version" = auto && cf_cv_shlib_version=rel
                if test "$cf_cv_shlib_version" = rel; then
-                       cf_shared_soname='`basename $@ .${REL_VERSION}`.${ABI_VERSION}'
+                       cf_shared_soname='`basename $[@] .${REL_VERSION}`.${ABI_VERSION}'
                else
-                       cf_shared_soname='`basename $@`'
+                       cf_shared_soname='`basename $[@]`'
                fi
                CC_SHARED_OPTS=
-               MK_SHARED_LIB='${CC} -shared -Wl,-rpath,${RPATH_LIST} -Wl,-h,'$cf_shared_soname' -o $@'
+               MK_SHARED_LIB='${CC} ${LDFLAGS} ${CFLAGS} -shared -Wl,-rpath,${RPATH_LIST} -Wl,-h,'$cf_shared_soname' -o $[@]'
                ;;
        (irix*)
                if test "$cf_cv_enable_rpath" = yes ; then
@@ -3097,14 +4065,14 @@ CF_EOF
                # tested with IRIX 5.2 and 'cc'.
                if test "$GCC" != yes; then
                        CC_SHARED_OPTS='-KPIC'
-                       MK_SHARED_LIB='${CC} -shared -rdata_shared -soname `basename $[@]` -o $[@]'
+                       MK_SHARED_LIB='${CC} ${LDFLAGS} ${CFLAGS} -shared -rdata_shared -soname `basename $[@]` -o $[@]'
                else
-                       MK_SHARED_LIB='${CC} -shared -Wl,-soname,`basename $[@]` -o $[@]'
+                       MK_SHARED_LIB='${CC} ${LDFLAGS} ${CFLAGS} -shared -Wl,-soname,`basename $[@]` -o $[@]'
                fi
                cf_cv_rm_so_locs=yes
                ;;
        (linux*|gnu*|k*bsd*-gnu)
-               if test "$DFT_LWR_MODEL" = "shared" ; then
+               if test "$DFT_LWR_MODEL" = "shared" && test -n "$LD_RPATH_OPT" ; then
                        LOCAL_LDFLAGS="${LD_RPATH_OPT}\$(LOCAL_LIBDIR)"
                        LOCAL_LDFLAGS2="$LOCAL_LDFLAGS"
                fi
@@ -3112,7 +4080,113 @@ CF_EOF
                        EXTRA_LDFLAGS="${cf_ld_rpath_opt}\${RPATH_LIST} $EXTRA_LDFLAGS"
                fi
                CF_SHARED_SONAME
-               MK_SHARED_LIB='${CC} ${CFLAGS} -shared -Wl,-soname,'$cf_cv_shared_soname',-stats,-lc -o $[@]'
+               MK_SHARED_LIB='${CC} ${LDFLAGS} ${CFLAGS} -shared -Wl,-soname,'$cf_cv_shared_soname',-stats,-lc -o $[@]'
+               ;;
+       (mingw*msvc*)
+               cf_cv_shlib_version=msvcdll
+               cf_cv_shlib_version_infix=msvcdll
+               shlibdir=$bindir
+               MAKE_DLLS=
+               if test "$DFT_LWR_MODEL" = "shared" ; then
+                       LOCAL_LDFLAGS="-link -dll"
+                       LOCAL_LDFLAGS2="$LOCAL_LDFLAGS"
+                       EXTRA_LDFLAGS="-link -dll $EXTRA_LDFLAGS"
+               fi
+               CC_SHARED_OPTS=
+               MK_SHARED_LIB=$SHELL' '$rel_builddir'/mk_shared_lib.sh [$]@ ${LD} [$]{CFLAGS}'
+               RM_SHARED_OPTS="$RM_SHARED_OPTS $rel_builddir/mk_shared_lib.sh *.dll.lib"
+               cat >mk_shared_lib.sh <<-CF_EOF
+               #!$SHELL
+               SHARED_LIB=\[$]1
+               IMPORT_LIB=\`echo "\[$]1" | sed -e 's/[[0-9]]*\.dll[$]/.dll.lib/'\`
+               shift
+               my_ld=\[$]1
+               shift
+               cat <<-EOF
+               Linking shared library
+               ** SHARED LIB \$SHARED_LIB
+               ** IMPORT_LIB \$IMPORT_LIB
+EOF
+               args=\$(echo \[$]* | sed -E "s#-l(\w*)#\1.dll.lib#g" | sed -E "s#-L(\w*)#-LIBPATH:\1#g")
+               exec \$my_ld -DLL -IMPLIB:"\${IMPORT_LIB}" -OUT:"\${SHARED_LIB}" ${LDFLAGS} \$args
+               mv "\${IMPORT_LIB}" "\${IMPORT_LIB}"
+CF_EOF
+               chmod +x mk_shared_lib.sh
+               cat >mk_prog.sh <<-CF_EOF
+               #!$SHELL
+               shift
+               # Ignore first argument (compiler) and use LD (link.exe) unconditionally
+               LD="[$]LD"
+               clopts=()
+               ldopts=("/subsystem:console")
+               libs=()
+               isdll=0
+               while test \[$]# -gt 0; do
+                       case "\[$]1" in
+                               -link)
+                                       # ignore -link argument
+                                       ;;
+                               -M[[TD]] | -M[[TD]]d)
+                                       # ignore runtime-library option
+                                       ;;
+                               -dll)
+                                       isdll=1
+                                       ;;
+                               -W* | -w*)
+                                       # ignore warnings
+                                       ;;
+                               -D*)
+                                       clopts+=("\[$]1")
+                                       ;;
+                               -I*)
+                                       clopts+=("\[$]1")
+                                       ;;
+                               -l*)
+                                       libs+=("\`echo \"\[$]1\" | sed \"s/^-l//\"\`")
+                                       ;;
+                               -L*)
+                                       ldopts+=("\`echo \"\[$]1\" | sed \"s/^-L/-LIBPATH:/\"\`")
+                                       ;;
+                               *.obj | *.o)
+                                       ldopts+=("\[$]1")
+                                       ;;
+                               -Wl,*)
+                                       for linkarg in \`echo '\[$]1' | sed -e 's/-Wl,//' -e 's/,/ /'\`; do
+                                               ldopts+=("\[$]{linkarg}")
+                                       done
+                                       ;;
+                               *.lib)
+                                       ldopts+=("\[$]1")
+                                       ;;
+                               -o)
+                                       shift
+                                       ldopts+=("-out:\[$]1")
+                                       ;;
+                               *)
+                                       clopts+=("\[$]1")
+                                       ldopts+=("\[$]1")
+                                       ;;
+                       esac
+                       shift
+               done
+               if [[ "\$isdll" -ne 0 ]]; then
+                       for lib in \[$]{libs[[*]]}; do
+                               ldopts+=("\[$]lib.dll.lib")
+                       done
+               else
+                       for lib in \[$]{libs[[*]]}; do
+                               ldopts+=("\[$]lib.lib")
+                       done
+               fi
+               cat <<-EOF
+               Creating program
+               ** ld options:   "\[$]{ldopts[[@]]}"
+EOF
+               exec \[$]LD \[$]{ldopts[[@]]}
+CF_EOF
+               chmod +x mk_prog.sh
+               LINK_PROGS="$SHELL ${rel_builddir}/mk_prog.sh"
+               LINK_TESTS="$SHELL ${rel_builddir}/mk_prog.sh"
                ;;
        (mingw*)
                cf_cv_shlib_version=mingw
@@ -3137,12 +4211,12 @@ CF_EOF
                ** SHARED_LIB \[$]SHARED_LIB
                ** IMPORT_LIB \[$]IMPORT_LIB
 EOF
-               exec \[$]* -shared -Wl,--enable-auto-import,--out-implib=\[$]{IMPORT_LIB} -Wl,--export-all-symbols -o \[$]{SHARED_LIB}
+               exec \[$]* ${LDFLAGS} -shared -Wl,--enable-auto-import,--out-implib=\[$]{IMPORT_LIB} -Wl,--export-all-symbols -o \[$]{SHARED_LIB}
 CF_EOF
                chmod +x mk_shared_lib.sh
                ;;
        (openbsd[[2-9]].*|mirbsd*)
-               if test "$DFT_LWR_MODEL" = "shared" ; then
+               if test "$DFT_LWR_MODEL" = "shared" && test -n "$LD_RPATH_OPT" ; then
                        LOCAL_LDFLAGS="${LD_RPATH_OPT}\$(LOCAL_LIBDIR)"
                        LOCAL_LDFLAGS2="$LOCAL_LDFLAGS"
                fi
@@ -3151,11 +4225,19 @@ CF_EOF
                fi
                CC_SHARED_OPTS="$CC_SHARED_OPTS -DPIC"
                CF_SHARED_SONAME
-               MK_SHARED_LIB='${CC} ${CFLAGS} -shared -Wl,-Bshareable,-soname,'$cf_cv_shared_soname',-stats,-lc -o $[@]'
+               MK_SHARED_LIB='${CC} ${LDFLAGS} ${CFLAGS} -shared -Wl,-Bshareable,-soname,'$cf_cv_shared_soname',-stats,-lc -o $[@]'
+               ;;
+       (nskJ*)
+               CC_SHARED_OPTS=
+               MK_SHARED_LIB='${LD} -Wshared -Weld=-export_all -o $[@]'
+               ;;
+       (nskL*)
+               CC_SHARED_OPTS=
+               MK_SHARED_LIB='${LD} -Wshared -Wxld=-export_all -o $[@]'
                ;;
        (nto-qnx*|openbsd*|freebsd[[12]].*)
                CC_SHARED_OPTS="$CC_SHARED_OPTS -DPIC"
-               MK_SHARED_LIB='${LD} -Bshareable -o $[@]'
+               MK_SHARED_LIB='${LD} ${LDFLAGS} -Bshareable -o $[@]'
                test "$cf_cv_shlib_version" = auto && cf_cv_shlib_version=rel
                ;;
        (dragonfly*|freebsd*)
@@ -3166,7 +4248,7 @@ CF_EOF
                        EXTRA_LDFLAGS="${cf_ld_rpath_opt}\${RPATH_LIST} $EXTRA_LDFLAGS"
                fi
                CF_SHARED_SONAME
-               MK_SHARED_LIB='${CC} ${CFLAGS} -shared -Wl,-soname,'$cf_cv_shared_soname',-stats,-lc -o $[@]'
+               MK_SHARED_LIB='${CC} ${LDFLAGS} ${CFLAGS} -shared -Wl,-soname,'$cf_cv_shared_soname',-stats,-lc -o $[@]'
                ;;
        (netbsd*)
                CC_SHARED_OPTS="$CC_SHARED_OPTS -DPIC"
@@ -3182,23 +4264,23 @@ CF_EOF
                        fi
                        fi
                        CF_SHARED_SONAME
-                       MK_SHARED_LIB='${CC} ${CFLAGS} -shared -Wl,-soname,'$cf_cv_shared_soname' -o $[@]'
+                       MK_SHARED_LIB='${CC} ${LDFLAGS} ${CFLAGS} -shared -Wl,-soname,'$cf_cv_shared_soname' -o $[@]'
                else
-                       MK_SHARED_LIB='${CC} -Wl,-shared -Wl,-Bshareable -o $[@]'
+                       MK_SHARED_LIB='${CC} ${LDFLAGS} ${CFLAGS} -shared -o $[@]'
                fi
                ;;
        (osf*|mls+*)
                # tested with OSF/1 V3.2 and 'cc'
                # tested with OSF/1 V3.2 and gcc 2.6.3 (but the c++ demo didn't
                # link with shared libs).
-               MK_SHARED_LIB='${LD} -set_version ${REL_VERSION}:${ABI_VERSION} -expect_unresolved "*" -shared -soname `basename $[@]`'
-               case $host_os in
+               MK_SHARED_LIB='${LD} ${LDFLAGS} -set_version ${REL_VERSION}:${ABI_VERSION} -expect_unresolved "*" -shared -soname `basename $[@]`'
+               case "$host_os" in
                (osf4*)
                        MK_SHARED_LIB="${MK_SHARED_LIB} -msym"
                        ;;
                esac
                MK_SHARED_LIB="${MK_SHARED_LIB}"' -o $[@]'
-               if test "$DFT_LWR_MODEL" = "shared" ; then
+               if test "$DFT_LWR_MODEL" = "shared" && test -n "$LD_RPATH_OPT" ; then
                        LOCAL_LDFLAGS="${LD_RPATH_OPT}\$(LOCAL_LIBDIR)"
                        LOCAL_LDFLAGS2="$LOCAL_LDFLAGS"
                fi
@@ -3209,7 +4291,7 @@ CF_EOF
                if test "$GCC" != yes; then
                        CC_SHARED_OPTS='-belf -KPIC'
                fi
-               MK_SHARED_LIB='${LD} -dy -G -h `basename $[@] .${REL_VERSION}`.${ABI_VERSION} -o [$]@'
+               MK_SHARED_LIB='${LD} ${LDFLAGS} -dy -G -h `basename $[@] .${REL_VERSION}`.${ABI_VERSION} -o [$]@'
                if test "$cf_cv_enable_rpath" = yes ; then
                        # only way is to set LD_RUN_PATH but no switch for it
                        RUN_PATH=$libdir
@@ -3223,7 +4305,7 @@ CF_EOF
                if test "$GCC" != yes; then
                        CC_SHARED_OPTS='-KPIC'
                fi
-               MK_SHARED_LIB='${LD} -assert pure-text -o $[@]'
+               MK_SHARED_LIB='${LD} ${LDFLAGS} -assert pure-text -o $[@]'
                test "$cf_cv_shlib_version" = auto && cf_cv_shlib_version=rel
                ;;
        (solaris2*)
@@ -3242,13 +4324,13 @@ CF_EOF
                        for cf_shared_opts in -xcode=pic32 -xcode=pic13 -KPIC -Kpic -O
                        do
                                CFLAGS="$cf_shared_opts $cf_save_CFLAGS"
-                               AC_TRY_COMPILE([#include <stdio.h>],[printf("Hello\n");],[break])
+                               AC_TRY_COMPILE([#include <stdio.h>],[printf("Hello\\n");],[break])
                        done
                        CFLAGS="$cf_save_CFLAGS"
                        CC_SHARED_OPTS=$cf_shared_opts
-                       MK_SHARED_LIB='${CC} -dy -G -h '$cf_cv_shared_soname' -o $[@]'
+                       MK_SHARED_LIB='${CC} ${LDFLAGS} ${CFLAGS} -dy -G -h '$cf_cv_shared_soname' -o $[@]'
                else
-                       MK_SHARED_LIB='${CC} -shared -dy -G -h '$cf_cv_shared_soname' -o $[@]'
+                       MK_SHARED_LIB='${CC} ${LDFLAGS} ${CFLAGS} -shared -dy -G -h '$cf_cv_shared_soname' -o $[@]'
                fi
                ;;
        (sysv5uw7*|unix_sv*)
@@ -3256,7 +4338,7 @@ CF_EOF
                if test "$GCC" != yes; then
                        CC_SHARED_OPTS='-KPIC'
                fi
-               MK_SHARED_LIB='${LD} -d y -G -o [$]@'
+               MK_SHARED_LIB='${LD} ${LDFLAGS} -d y -G -o [$]@'
                ;;
        (*)
                CC_SHARED_OPTS='unknown'
@@ -3285,7 +4367,7 @@ cat > conftest.$ac_ext <<EOF
 #include <stdio.h>
 int main(int argc, char *argv[[]])
 {
-       printf("hello\n");
+       printf("hello\\n");
        return (argv[[argc-1]] == 0) ;
 }
 EOF
@@ -3309,7 +4391,7 @@ EOF
        test -n "$cf_ld_rpath_opt" && MK_SHARED_LIB="$MK_SHARED_LIB $cf_ld_rpath_opt\${RPATH_LIST}"
        test -z "$RPATH_LIST" && RPATH_LIST="\${libdir}"
 
-       test $cf_cv_rm_so_locs = yes && RM_SHARED_OPTS="$RM_SHARED_OPTS so_locations"
+       test "$cf_cv_rm_so_locs" = yes && RM_SHARED_OPTS="$RM_SHARED_OPTS so_locations"
 
        CF_VERBOSE(CC_SHARED_OPTS: $CC_SHARED_OPTS)
        CF_VERBOSE(MK_SHARED_LIB:  $MK_SHARED_LIB)
@@ -3349,11 +4431,11 @@ define([CF_SHARED_SONAME],
        fi
 ])
 dnl ---------------------------------------------------------------------------
-dnl CF_STRIP_G_OPT version: 3 updated: 2002/12/21 19:25:52
+dnl CF_STRIP_G_OPT version: 4 updated: 2021/01/02 09:31:20
 dnl --------------
 dnl    Remove "-g" option from the compiler options
 AC_DEFUN([CF_STRIP_G_OPT],
-[$1=`echo ${$1} | sed -e 's%-g %%' -e 's%-g$%%'`])dnl
+[$1=`echo "${$1}" | CF__SED_TRIMBLANKS(-e 's%-g %%' -e 's%-g$%%')`])dnl
 dnl ---------------------------------------------------------------------------
 dnl CF_SUBDIR_PATH version: 7 updated: 2014/12/04 04:33:06
 dnl --------------
@@ -3379,14 +4461,14 @@ do
 done
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_TERM_HEADER version: 4 updated: 2015/04/15 19:08:48
+dnl CF_TERM_HEADER version: 6 updated: 2021/01/02 09:31:20
 dnl --------------
 dnl Look for term.h, which is part of X/Open curses.  It defines the interface
 dnl to terminfo database.  Usually it is in the same include-path as curses.h,
 dnl but some packagers change this, breaking various applications.
 AC_DEFUN([CF_TERM_HEADER],[
 AC_CACHE_CHECK(for terminfo header, cf_cv_term_header,[
-case ${cf_cv_ncurses_header} in
+case "${cf_cv_ncurses_header}" in
 (*/ncurses.h|*/ncursesw.h)
        cf_term_header=`echo "$cf_cv_ncurses_header" | sed -e 's%ncurses[[^.]]*\.h$%term.h%'`
        ;;
@@ -3400,7 +4482,7 @@ do
 AC_TRY_COMPILE([#include <stdio.h>
 #include <${cf_cv_ncurses_header:-curses.h}>
 #include <$cf_test>
-],[int x = auto_left_margin],[
+],[int x = auto_left_margin; (void)x],[
        cf_cv_term_header="$cf_test"],[
        cf_cv_term_header=unknown
        ])
@@ -3410,13 +4492,13 @@ done
 
 # Set definitions to allow ifdef'ing to accommodate subdirectories
 
-case $cf_cv_term_header in
+case "$cf_cv_term_header" in
 (*term.h)
        AC_DEFINE(HAVE_TERM_H,1,[Define to 1 if we have term.h])
        ;;
 esac
 
-case $cf_cv_term_header in
+case "$cf_cv_term_header" in
 (ncurses/term.h)
        AC_DEFINE(HAVE_NCURSES_TERM_H,1,[Define to 1 if we have ncurses/term.h])
        ;;
@@ -3435,7 +4517,7 @@ top_builddir=ifelse($1,,`pwd`,$1)
 AC_SUBST(top_builddir)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_TRY_XOPEN_SOURCE version: 1 updated: 2011/10/30 17:09:50
+dnl CF_TRY_XOPEN_SOURCE version: 3 updated: 2021/08/28 15:20:37
 dnl -------------------
 dnl If _XOPEN_SOURCE is not defined in the compile environment, check if we
 dnl can define it successfully.
@@ -3451,7 +4533,7 @@ make an error
 #endif],
        [cf_cv_xopen_source=no],
        [cf_save="$CPPFLAGS"
-        CPPFLAGS="$CPPFLAGS -D_XOPEN_SOURCE=$cf_XOPEN_SOURCE"
+        CF_APPEND_TEXT(CPPFLAGS,-D_XOPEN_SOURCE=$cf_XOPEN_SOURCE)
         AC_TRY_COMPILE([
 #include <stdlib.h>
 #include <string.h>
@@ -3470,7 +4552,7 @@ if test "$cf_cv_xopen_source" != no ; then
        CF_REMOVE_DEFINE(CFLAGS,$CFLAGS,_XOPEN_SOURCE)
        CF_REMOVE_DEFINE(CPPFLAGS,$CPPFLAGS,_XOPEN_SOURCE)
        cf_temp_xopen_source="-D_XOPEN_SOURCE=$cf_cv_xopen_source"
-       CF_ADD_CFLAGS($cf_temp_xopen_source)
+       CF_APPEND_CFLAGS($cf_temp_xopen_source)
 fi
 ])
 dnl ---------------------------------------------------------------------------
@@ -3483,15 +4565,21 @@ AC_DEFUN([CF_UPPER],
 $1=`echo "$2" | sed y%abcdefghijklmnopqrstuvwxyz./-%ABCDEFGHIJKLMNOPQRSTUVWXYZ___%`
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_UTF8_LIB version: 8 updated: 2012/10/06 08:57:51
+dnl CF_UTF8_LIB version: 9 updated: 2021/05/19 19:35:25
 dnl -----------
 dnl Check for multibyte support, and if not found, utf8 compatibility library
 AC_DEFUN([CF_UTF8_LIB],
 [
+AC_HAVE_HEADERS(wchar.h)
 AC_CACHE_CHECK(for multibyte character support,cf_cv_utf8_lib,[
        cf_save_LIBS="$LIBS"
        AC_TRY_LINK([
-#include <stdlib.h>],[putwc(0,0);],
+#include <stdlib.h>
+#include <stdio.h>
+#ifdef HAVE_WCHAR_H
+#include <wchar.h>
+#endif
+],[putwc(0,0);],
        [cf_cv_utf8_lib=yes],
        [CF_FIND_LINKAGE([
 #include <libutf8.h>],[putwc(0,0);],utf8,
@@ -3570,6 +4658,27 @@ AC_SUBST(ADA_INCLUDE)
 AC_MSG_RESULT($ADA_INCLUDE)
 ])dnl
 dnl ---------------------------------------------------------------------------
+dnl CF_WITH_ADA_LIBNAME version: 1 updated: 2019/09/07 18:59:41
+dnl -------------------
+dnl CF_WITH_ADA_LIBNAME
+dnl -------------------
+dnl Command-line option to specify how to name the resulting Ada library.
+dnl $1 = default value
+AC_DEFUN([CF_WITH_ADA_LIBNAME],[
+AC_MSG_CHECKING(for ada-libname)
+AC_ARG_WITH(ada-libname,
+   [  --with-ada-libname=XXX  override default Ada library-name],
+   ADA_LIBNAME=[$]withval,
+   ADA_LIBNAME=$1)
+case "x$ADA_LIBNAME" in
+(x|xyes|xno)
+       ADA_LIBNAME=$1
+       ;;
+esac
+AC_SUBST(ADA_LIBNAME)
+AC_MSG_RESULT($ADA_LIBNAME)
+])dnl
+dnl ---------------------------------------------------------------------------
 dnl CF_WITH_ADA_OBJECTS version: 2 updated: 2010/06/26 17:35:58
 dnl -------------------
 dnl Command-line option to specify where Ada objects will install.
@@ -3584,11 +4693,12 @@ AC_SUBST(ADA_OBJECTS)
 AC_MSG_RESULT($ADA_OBJECTS)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_WITH_ADA_SHAREDLIB version: 4 updated: 2014/05/31 21:08:37
+dnl CF_WITH_ADA_SHAREDLIB version: 5 updated: 2018/07/21 19:10:35
 dnl ---------------------
 dnl Command-line option to specify if an Ada95 shared-library should be built,
 dnl and optionally what its soname should be.
 AC_DEFUN([CF_WITH_ADA_SHAREDLIB],[
+AC_REQUIRE([CF_GNAT_PROJECTS])
 AC_MSG_CHECKING(if an Ada95 shared-library should be built)
 AC_ARG_WITH(ada-sharedlib,
        [  --with-ada-sharedlib=soname build shared-library (requires GNAT projects)],
@@ -3596,6 +4706,15 @@ AC_ARG_WITH(ada-sharedlib,
        [with_ada_sharedlib=no])
 AC_MSG_RESULT($with_ada_sharedlib)
 
+if test "x$with_ada_sharedlib" != xno
+then
+       if test "x$cf_gnat_projects" != xyes
+       then
+               AC_MSG_WARN(disabling shared-library since GNAT projects are not supported)
+               with_ada_sharedlib=no
+       fi
+fi
+
 ADA_SHAREDLIB='lib$(LIB_NAME).so.1'
 MAKE_ADA_SHAREDLIB="#"
 
@@ -3612,7 +4731,7 @@ AC_SUBST(ADA_SHAREDLIB)
 AC_SUBST(MAKE_ADA_SHAREDLIB)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_WITH_CURSES_DIR version: 3 updated: 2010/11/20 17:02:38
+dnl CF_WITH_CURSES_DIR version: 4 updated: 2021/01/02 19:22:58
 dnl ------------------
 dnl Wrapper for AC_ARG_WITH to specify directory under which to look for curses
 dnl libraries.
@@ -3625,7 +4744,7 @@ AC_ARG_WITH(curses-dir,
        [cf_cv_curses_dir=no])
 AC_MSG_RESULT($cf_cv_curses_dir)
 
-if ( test -n "$cf_cv_curses_dir" && test "$cf_cv_curses_dir" != "no" )
+if test -n "$cf_cv_curses_dir" && test "$cf_cv_curses_dir" != "no"
 then
        CF_PATH_SYNTAX(withval)
        if test -d "$cf_cv_curses_dir"
@@ -3636,7 +4755,7 @@ then
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_WITH_LIB_PREFIX version: 1 updated: 2012/01/21 19:28:10
+dnl CF_WITH_LIB_PREFIX version: 2 updated: 2021/01/01 16:53:59
 dnl ------------------
 dnl Allow the library-prefix to be overridden.  OS/2 EMX originally had no
 dnl "lib" prefix, e.g., because it used the dll naming convention.
@@ -3651,10 +4770,10 @@ AC_ARG_WITH(lib-prefix,
        [with_lib_prefix=auto])
 AC_MSG_RESULT($with_lib_prefix)
 
-if test $with_lib_prefix = auto
+if test "$with_lib_prefix" = auto
 then
        CF_LIB_PREFIX($1)
-elif test $with_lib_prefix = no
+elif test "$with_lib_prefix" = no
 then
        LIB_PREFIX=
 else
@@ -3662,7 +4781,7 @@ else
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_WITH_PATH version: 11 updated: 2012/09/29 15:04:19
+dnl CF_WITH_PATH version: 12 updated: 2021/09/04 06:35:04
 dnl ------------
 dnl Wrapper for AC_ARG_WITH to ensure that user supplies a pathname, not just
 dnl defaulting to yes/no.
@@ -3671,7 +4790,7 @@ dnl $1 = option name
 dnl $2 = help-text
 dnl $3 = environment variable to set
 dnl $4 = default value, shown in the help-message, must be a constant
-dnl $5 = default value, if it's an expression & cannot be in the help-message
+dnl $5 = default value, if it is an expression & cannot be in the help-message
 dnl
 AC_DEFUN([CF_WITH_PATH],
 [AC_ARG_WITH($1,[$2 ](default: ifelse([$4],,empty,[$4])),,
@@ -3683,12 +4802,21 @@ eval $3="$withval"
 AC_SUBST($3)dnl
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_WITH_PKG_CONFIG_LIBDIR version: 10 updated: 2015/08/22 17:10:56
+dnl CF_WITH_PKG_CONFIG_LIBDIR version: 19 updated: 2021/11/20 14:57:36
 dnl -------------------------
 dnl Allow the choice of the pkg-config library directory to be overridden.
+dnl
+dnl pkg-config uses a search-list built from these colon-separated lists of
+dnl directories:
+dnl a) $PKG_CONFIG_PATH (tested first, added if set)
+dnl b) $PKG_CONFIG_LIBDIR (tested second, added if set)
+dnl c) builtin-list (added if $PKG_CONFIG_LIBDIR is not set)
+dnl
+dnl pkgconf (used with some systems such as FreeBSD in place of pkg-config)
+dnl optionally ignores $PKG_CONFIG_LIBDIR.
 AC_DEFUN([CF_WITH_PKG_CONFIG_LIBDIR],[
 
-case $PKG_CONFIG in
+case "$PKG_CONFIG" in
 (no|none|yes)
        AC_MSG_CHECKING(for pkg-config library directory)
        ;;
@@ -3697,68 +4825,110 @@ case $PKG_CONFIG in
        ;;
 esac
 
-PKG_CONFIG_LIBDIR=no
+# if $PKG_CONFIG_LIBDIR is set, try to use that
+cf_search_path=`echo "$PKG_CONFIG_LIBDIR" | sed -e 's/:/ /g' -e 's,^[[         ]]*,,'`
+
+# if the option is used, let that override.  otherwise default to "libdir"
 AC_ARG_WITH(pkg-config-libdir,
        [  --with-pkg-config-libdir=XXX use given directory for installing pc-files],
-       [PKG_CONFIG_LIBDIR=$withval],
-       [test "x$PKG_CONFIG" != xnone && PKG_CONFIG_LIBDIR=yes])
+       [cf_search_path=$withval],
+       [test "x$PKG_CONFIG" != xnone && test -z "$cf_search_path" && cf_search_path=libdir])
 
-case x$PKG_CONFIG_LIBDIR in
+case x$cf_search_path in
+(xlibdir)
+       PKG_CONFIG_LIBDIR='${libdir}/pkgconfig'
+       AC_MSG_RESULT($PKG_CONFIG_LIBDIR)
+       cf_search_path=
+       ;;
+(x)
+       ;;
 (x/*)
+       PKG_CONFIG_LIBDIR="$cf_search_path"
+       AC_MSG_RESULT($PKG_CONFIG_LIBDIR)
+       cf_search_path=
        ;;
-(xyes)
+(xyes|xauto)
+       AC_MSG_RESULT(auto)
+       cf_search_path=
        # Look for the library directory using the same prefix as the executable
-       if test "x$PKG_CONFIG" = xnone
+       AC_MSG_CHECKING(for search-list)
+       if test "x$PKG_CONFIG" != xnone
        then
-               cf_path=$prefix
-       else
-               cf_path=`echo "$PKG_CONFIG" | sed -e 's,/[[^/]]*/[[^/]]*$,,'`
+               # works for pkg-config since version 0.24 (2009)
+               # works for pkgconf since version 0.8.3 (2012)
+               for cf_pkg_program in \
+                       `echo "$PKG_CONFIG" | sed -e 's,^.*/,,'` \
+                       pkg-config \
+                       pkgconf
+               do
+                       cf_search_path=`"$PKG_CONFIG" --variable=pc_path "$cf_pkg_program" 2>/dev/null | tr : ' '`
+                       test -n "$cf_search_path" && break
+               done
+
+               # works for pkg-config since import in 2005 of original 2001 HP code.
+               test -z "$cf_search_path" && \
+               cf_search_path=`
+               "$PKG_CONFIG" --debug --exists no-such-package 2>&1 | $AWK "\
+/^Scanning directory (#[1-9][0-9]* )?'.*'$/{ \
+       sub(\"^[[^']]*'\",\"\"); \
+       sub(\"'.*\",\"\"); \
+       printf \" %s\", \\[$]0; } \
+{ next; } \
+"`
        fi
 
-       # If you don't like using the default architecture, you have to specify the
-       # intended library directory and corresponding compiler/linker options.
-       #
-       # This case allows for Debian's 2014-flavor of multiarch, along with the
-       # most common variations before that point.  Some other variants spell the
-       # directory differently, e.g., "pkg-config", and put it in unusual places.
-       # pkg-config has always been poorly standardized, which is ironic...
-       case x`(arch) 2>/dev/null` in
-       (*64)
-               cf_search_path="\
-                       $cf_path/lib/*64-linux-gnu \
-                       $cf_path/share \
-                       $cf_path/lib64 \
-                       $cf_path/lib32 \
-                       $cf_path/lib"
-               ;;
-       (*)
-               cf_search_path="\
-                       $cf_path/lib/*-linux-gnu \
-                       $cf_path/share \
-                       $cf_path/lib32 \
-                       $cf_path/lib \
-                       $cf_path/libdata"
-               ;;
-       esac
+       AC_MSG_RESULT($cf_search_path)
+       ;;
+(*)
+       AC_MSG_ERROR(Unexpected option value: $cf_search_path)
+       ;;
+esac
 
-       CF_VERBOSE(list...)
+if test -n "$cf_search_path"
+then
+       AC_MSG_CHECKING(for first directory)
+       cf_pkg_config_path=none
        for cf_config in $cf_search_path
        do
-               CF_VERBOSE(checking $cf_config/pkgconfig)
-               if test -d $cf_config/pkgconfig
+               if test -d "$cf_config"
                then
-                       PKG_CONFIG_LIBDIR=$cf_config/pkgconfig
-                       AC_MSG_CHECKING(done)
+                       cf_pkg_config_path=$cf_config
                        break
                fi
        done
-       ;;
-(*)
-       ;;
-esac
+       AC_MSG_RESULT($cf_pkg_config_path)
 
-if test "x$PKG_CONFIG_LIBDIR" != xno ; then
-       AC_MSG_RESULT($PKG_CONFIG_LIBDIR)
+       if test "x$cf_pkg_config_path" != xnone ; then
+               # limit this to the first directory found
+               PKG_CONFIG_LIBDIR="$cf_pkg_config_path"
+       fi
+
+       if test -z "$PKG_CONFIG_LIBDIR" && test -n "$cf_search_path"
+       then
+               AC_MSG_CHECKING(for workaround)
+               if test "$prefix" = "NONE" ; then
+                       cf_prefix="$ac_default_prefix"
+               else
+                       cf_prefix="$prefix"
+               fi
+               eval cf_libdir=$libdir
+               cf_libdir=`echo "$cf_libdir" | sed -e "s,^NONE,$cf_prefix,"`
+               cf_backup=
+               for cf_config in $cf_search_path
+               do
+                       case $cf_config in
+                       $cf_libdir/pkgconfig)
+                               PKG_CONFIG_LIBDIR=$cf_libdir/pkgconfig
+                               break
+                               ;;
+                       *)
+                               test -z "$cf_backup" && cf_backup=$cf_config
+                               ;;
+                       esac
+               done
+               test -z "$PKG_CONFIG_LIBDIR" && PKG_CONFIG_LIBDIR=$cf_backup
+               AC_MSG_RESULT($PKG_CONFIG_LIBDIR)
+       fi
 fi
 
 AC_SUBST(PKG_CONFIG_LIBDIR)
@@ -3826,7 +4996,7 @@ AC_ARG_WITH(system-type,
 ])
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_XOPEN_SOURCE version: 50 updated: 2015/10/17 19:03:33
+dnl CF_XOPEN_SOURCE version: 59 updated: 2021/08/28 15:20:37
 dnl ---------------
 dnl Try to get _XOPEN_SOURCE defined properly that we can use POSIX functions,
 dnl or adapt to the vendor's definitions to get equivalent functionality,
@@ -3837,16 +5007,19 @@ dnl     $1 is the nominal value for _XOPEN_SOURCE
 dnl    $2 is the nominal value for _POSIX_C_SOURCE
 AC_DEFUN([CF_XOPEN_SOURCE],[
 AC_REQUIRE([AC_CANONICAL_HOST])
+AC_REQUIRE([CF_POSIX_VISIBLE])
+
+if test "$cf_cv_posix_visible" = no; then
 
 cf_XOPEN_SOURCE=ifelse([$1],,500,[$1])
 cf_POSIX_C_SOURCE=ifelse([$2],,199506L,[$2])
 cf_xopen_source=
 
-case $host_os in
+case "$host_os" in
 (aix[[4-7]]*)
        cf_xopen_source="-D_ALL_SOURCE"
        ;;
-(cygwin|msys)
+(msys)
        cf_XOPEN_SOURCE=600
        ;;
 (darwin[[0-8]].*)
@@ -3856,7 +5029,7 @@ case $host_os in
        cf_xopen_source="-D_DARWIN_C_SOURCE"
        cf_XOPEN_SOURCE=
        ;;
-(freebsd*|dragonfly*)
+(freebsd*|dragonfly*|midnightbsd*)
        # 5.x headers associate
        #       _XOPEN_SOURCE=600 with _POSIX_C_SOURCE=200112L
        #       _XOPEN_SOURCE=500 with _POSIX_C_SOURCE=199506L
@@ -3874,8 +5047,8 @@ case $host_os in
        cf_xopen_source="-D_SGI_SOURCE"
        cf_XOPEN_SOURCE=
        ;;
-(linux*|gnu*|mint*|k*bsd*-gnu)
-       CF_GNU_SOURCE
+(linux*|uclinux*|gnu*|mint*|k*bsd*-gnu|cygwin)
+       CF_GNU_SOURCE($cf_XOPEN_SOURCE)
        ;;
 (minix*)
        cf_xopen_source="-D_NETBSD_SOURCE" # POSIX.1-2001 features are ifdef'd with this...
@@ -3888,7 +5061,15 @@ case $host_os in
 (netbsd*)
        cf_xopen_source="-D_NETBSD_SOURCE" # setting _XOPEN_SOURCE breaks IPv6 for lynx on NetBSD 1.6, breaks xterm, is not needed for ncursesw
        ;;
-(openbsd[[4-9]]*)
+(openbsd[[6-9]]*)
+       # OpenBSD 6.x has broken locale support, both compile-time and runtime.
+       # see https://www.mail-archive.com/bugs@openbsd.org/msg13200.html
+       # Abusing the conformance level is a workaround.
+       AC_MSG_WARN(this system does not provide usable locale support)
+       cf_xopen_source="-D_BSD_SOURCE"
+       cf_XOPEN_SOURCE=700
+       ;;
+(openbsd[[4-5]]*)
        # setting _XOPEN_SOURCE lower than 500 breaks g++ compile with wchar.h, needed for ncursesw
        cf_xopen_source="-D_BSD_SOURCE"
        cf_XOPEN_SOURCE=600
@@ -3896,9 +5077,6 @@ case $host_os in
 (openbsd*)
        # setting _XOPEN_SOURCE breaks xterm on OpenBSD 2.8, is not needed for ncursesw
        ;;
-(os2*)
-       cf_XOPEN_SOURCE=
-       ;;
 (osf[[45]]*)
        cf_xopen_source="-D_OSF_SOURCE"
        ;;
@@ -3923,7 +5101,7 @@ case $host_os in
 esac
 
 if test -n "$cf_xopen_source" ; then
-       CF_ADD_CFLAGS($cf_xopen_source,true)
+       CF_APPEND_CFLAGS($cf_xopen_source,true)
 fi
 
 dnl In anything but the default case, we may have system-specific setting
@@ -3938,7 +5116,7 @@ make an error
        [cf_XOPEN_SOURCE_set=yes],
        [cf_XOPEN_SOURCE_set=no])
        AC_MSG_RESULT($cf_XOPEN_SOURCE_set)
-       if test $cf_XOPEN_SOURCE_set = yes
+       if test "$cf_XOPEN_SOURCE_set" = yes
        then
                AC_TRY_COMPILE([#include <stdlib.h>],[
 #if (_XOPEN_SOURCE - 0) < $cf_XOPEN_SOURCE
@@ -3946,7 +5124,7 @@ make an error
 #endif],
                [cf_XOPEN_SOURCE_set_ok=yes],
                [cf_XOPEN_SOURCE_set_ok=no])
-               if test $cf_XOPEN_SOURCE_set_ok = no
+               if test "$cf_XOPEN_SOURCE_set_ok" = no
                then
                        AC_MSG_WARN(_XOPEN_SOURCE is lower than requested)
                fi
@@ -3954,4 +5132,11 @@ make an error
                CF_TRY_XOPEN_SOURCE
        fi
 fi
+fi # cf_cv_posix_visible
 ])
+dnl ---------------------------------------------------------------------------
+dnl CF__SED_TRIMBLANKS version: 1 updated: 2021/01/02 09:31:20
+dnl ------------------
+dnl Trim something using sed, then trim extra whitespace
+dnl $1 = extra parameters, e.g., in CF_STRIP_G_OPT
+define([CF__SED_TRIMBLANKS],[sed ifelse($1,,,[$1] )-e 's%[[    ]]% %g' -e 's% [[ ]]*% %g' -e 's%^ %%' -e 's% [$]%%'])dnl