]> ncurses.scripts.mit.edu Git - ncurses.git/blobdiff - aclocal.m4
ncurses 5.9 - patch 20120114
[ncurses.git] / aclocal.m4
index 46ba5e7b0780a144238281417b7fc0a021ce1023..15d6056583af1d7431609bdb4c50e93e8c38be01 100644 (file)
@@ -1,5 +1,5 @@
 dnl***************************************************************************
-dnl Copyright (c) 1998-2010,2011 Free Software Foundation, Inc.              *
+dnl Copyright (c) 1998-2011,2012 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            *
@@ -28,7 +28,7 @@ dnl***************************************************************************
 dnl
 dnl Author: Thomas E. Dickey 1995-on
 dnl
-dnl $Id: aclocal.m4,v 1.577 2011/10/22 18:58:44 tom Exp $
+dnl $Id: aclocal.m4,v 1.601 2012/01/14 17:33:33 tom Exp $
 dnl Macros used in NCURSES auto-configuration script.
 dnl
 dnl These macros are maintained separately from NCURSES.  The copyright on
@@ -511,7 +511,7 @@ fi
 AC_SUBST(ARFLAGS)
 ])
 dnl ---------------------------------------------------------------------------
-dnl CF_AWK_BIG_PRINTF version: 3 updated: 2008/12/27 12:30:03
+dnl CF_AWK_BIG_PRINTF version: 4 updated: 2011/10/30 17:09:50
 dnl -----------------
 dnl Check if awk can handle big strings using printf.  Some older versions of
 dnl awk choke on large strings passed via "%s".
@@ -525,8 +525,8 @@ AC_DEFUN([CF_AWK_BIG_PRINTF],
                eval $2=no
                ;;
        *) #(vi
-               if ( ${AWK} 'BEGIN { xx = "x"; while (length(xx) < $1) { xx = xx "x"; }; printf("%s\n", xx); }' \
-                       | $AWK '{ printf "%d\n", length([$]0); }' | $AWK 'BEGIN { eqls=0; recs=0; } { recs++; if ([$]0 == 12000) eqls++; } END { if (recs != 1 || eqls != 1) exit 1; }' 2>/dev/null >/dev/null ) ; then
+               if ( ${AWK} 'BEGIN { xx = "x"; while (length(xx) < $1) { xx = xx "x"; }; printf("%s\n", xx); }' 2>/dev/null \
+                       | $AWK '{ printf "%d\n", length([$]0); }' 2>/dev/null | $AWK 'BEGIN { eqls=0; recs=0; } { recs++; if ([$]0 == 12000) eqls++; } END { if (recs != 1 || eqls != 1) exit 1; }' 2>/dev/null >/dev/null ) ; then
                        eval $2=yes
                else
                        eval $2=no
@@ -975,7 +975,28 @@ if test "$cf_cv_check_gpm_wgetch" != yes ; then
 fi
 ])])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_CPP_PARAM_INIT version: 4 updated: 2001/04/07 22:31:18
+dnl CF_CHECK_WCHAR_H version: 1 updated: 2011/10/29 15:01:05
+dnl ----------------
+dnl Check if wchar.h can be used, i.e., without defining _XOPEN_SOURCE_EXTENDED
+AC_DEFUN([CF_CHECK_WCHAR_H],[
+AC_CACHE_CHECK(if wchar.h can be used as is,cf_cv_wchar_h_okay,[
+AC_TRY_COMPILE(
+[
+#include <stdlib.h>
+#include <wchar.h>
+],[
+       wint_t foo = 0;
+       int bar = iswpunct(foo)],
+       [cf_cv_wchar_h_okay=yes],
+       [cf_cv_wchar_h_okay=no])])
+
+if test $cf_cv_wchar_h_okay = no
+then
+       CF_PREDEFINE(_XOPEN_SOURCE_EXTENDED)
+fi
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_CPP_PARAM_INIT version: 5 updated: 2011/12/03 16:54:03
 dnl -----------------
 dnl Check if the C++ compiler accepts duplicate parameter initialization.  This
 dnl is a late feature for the standard and is not in some recent compilers
@@ -999,7 +1020,7 @@ TEST::TEST(int x = 1)      // some compilers do not like second initializer
 {
        value = x;
 }
-void main() { }
+int main() { }
 ],
        [cf_cv_cpp_param_init=yes],
        [cf_cv_cpp_param_init=no],
@@ -1066,6 +1087,54 @@ fi
 test "$cf_cv_cpp_static_cast" = yes && AC_DEFINE(CPP_HAS_STATIC_CAST)
 ])dnl
 dnl ---------------------------------------------------------------------------
+dnl CF_CXX_AR_FLAGS version: 1 updated: 2011/10/29 08:35:34
+dnl ---------------
+dnl Setup special archiver flags for given compilers.
+AC_DEFUN([CF_CXX_AR_FLAGS],[
+       CXX_AR='$(AR)'
+       CXX_ARFLAGS='$(ARFLAGS)'
+       case $cf_cv_system_name in #(vi
+       irix*) #(vi
+           if test "$GXX" != yes ; then
+               CXX_AR='$(CXX)'
+               CXX_ARFLAGS='-ar -o'
+           fi
+           ;;
+       sco3.2v5*) #(vi
+           CXXLDFLAGS="-u main"
+           ;;
+       solaris2*)
+           if test "$GXX" != yes ; then
+               CXX_AR='$(CXX)'
+               CXX_ARFLAGS='-xar -o'
+           fi
+           ;;
+       esac
+       AC_SUBST(CXXLDFLAGS)
+       AC_SUBST(CXX_AR)
+       AC_SUBST(CXX_ARFLAGS)
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_CXX_IOSTREAM_NAMESPACE version: 1 updated: 2011/10/29 08:35:34
+dnl -------------------------
+dnl For c++, check if iostream uses "std::" namespace.
+AC_DEFUN([CF_CXX_IOSTREAM_NAMESPACE],[
+AC_CHECK_HEADERS(iostream)
+if test x"$ac_cv_header_iostream" = xyes ; then
+       AC_MSG_CHECKING(if iostream uses std-namespace)
+       AC_TRY_COMPILE([
+#include <iostream>
+using std::endl;
+using std::cerr;],[
+cerr << "testing" << endl;
+],[cf_iostream_namespace=yes],[cf_iostream_namespace=no])
+       AC_MSG_RESULT($cf_iostream_namespace)
+       if test "$cf_iostream_namespace" = yes ; then
+               AC_DEFINE(IOSTREAM_NAMESPACE)
+       fi
+fi
+])dnl
+dnl ---------------------------------------------------------------------------
 dnl CF_C_INLINE version: 3 updated: 2010/05/01 15:14:41
 dnl -----------
 dnl Check if the C compiler supports "inline".
@@ -1190,7 +1259,7 @@ if test "$cf_disable_rpath_hack" = no ; then
 fi
 ])
 dnl ---------------------------------------------------------------------------
-dnl CF_ENABLE_PC_FILES version: 6 updated: 2011/09/10 16:31:04
+dnl CF_ENABLE_PC_FILES version: 7 updated: 2011/12/10 18:58:47
 dnl ------------------
 dnl This is the "--enable-pc-files" option, which is available if there is a
 dnl pkg-config configuration on the local machine.
@@ -1198,7 +1267,7 @@ AC_DEFUN([CF_ENABLE_PC_FILES],[
 AC_REQUIRE([CF_PKG_CONFIG])
 AC_REQUIRE([CF_WITH_PKG_CONFIG_LIBDIR])
 
-if test "$PKG_CONFIG" != no ; then
+if test "$PKG_CONFIG" != none ; then
        if test -n "$PKG_CONFIG_LIBDIR" && test -d "$PKG_CONFIG_LIBDIR" ; then
                AC_MSG_CHECKING(if we should install .pc files for $PKG_CONFIG)
                AC_ARG_ENABLE(pc-files,
@@ -1237,7 +1306,7 @@ AC_DEFUN([CF_ERRNO],
 CF_CHECK_ERRNO(errno)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_ETIP_DEFINES version: 3 updated: 2003/03/22 19:13:43
+dnl CF_ETIP_DEFINES version: 4 updated: 2011/12/03 16:54:03
 dnl ---------------
 dnl Test for conflicting definitions of exception in gcc 2.8.0, etc., between
 dnl math.h and builtin.h, only for ncurses
@@ -1246,11 +1315,17 @@ AC_DEFUN([CF_ETIP_DEFINES],
 AC_MSG_CHECKING(for special defines needed for etip.h)
 cf_save_CXXFLAGS="$CXXFLAGS"
 cf_result="none"
+
+# etip.h includes ncurses.h which includes ncurses_dll.h
+# But ncurses_dll.h is generated - fix here.
+test -d include || mkdir include
+test -f include/ncurses_dll.h || sed -e 's/@NCURSES_WRAP_PREFIX@/'$NCURSES_WRAP_PREFIX'/g' ${srcdir}/include/ncurses_dll.h.in >include/ncurses_dll.h
+
 for cf_math in "" MATH_H
 do
 for cf_excp in "" MATH_EXCEPTION
 do
-       CXXFLAGS="$cf_save_CXXFLAGS -I${srcdir}/c++ -I${srcdir}/menu -I${srcdir}/include"
+       CXXFLAGS="$cf_save_CXXFLAGS -I${srcdir}/c++ -I${srcdir}/menu -Iinclude -I${srcdir}/include"
        test -n "$cf_math" && CXXFLAGS="$CXXFLAGS -DETIP_NEEDS_${cf_math}"
        test -n "$cf_excp" && CXXFLAGS="$CXXFLAGS -DETIP_NEEDS_${cf_excp}"
 AC_TRY_COMPILE([
@@ -2898,7 +2973,7 @@ ifelse($1,,,[$1=$LIB_PREFIX])
        AC_SUBST(LIB_PREFIX)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_LIB_RULES version: 61 updated: 2010/10/23 16:10:30
+dnl CF_LIB_RULES version: 62 updated: 2011/12/17 16:17:33
 dnl ------------
 dnl Append definitions and rules for the given models to the subdirectory
 dnl Makefiles, and the recursion rule for the top-level Makefile.  If the
@@ -3135,6 +3210,7 @@ do
                                prefix=$cf_prefix \
                                suffix=$cf_suffix \
                                subset=$cf_subset \
+                               driver=$cf_cv_term_driver \
                                SymLink="$LN_S" \
                                TermlibRoot=$TINFO_NAME \
                                TermlibSuffix=$TINFO_SUFFIX \
@@ -4896,7 +4972,7 @@ AC_MSG_RESULT($cf_prog_ln_sf)
 test "$cf_prog_ln_sf" = yes && LN_S="$LN_S -f"
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_REGEX version: 8 updated: 2010/08/07 14:09:44
+dnl CF_REGEX version: 9 updated: 2012/01/07 15:08:24
 dnl --------
 dnl Attempt to determine if we've got one of the flavors of regular-expression
 dnl code that we can support.
@@ -4908,7 +4984,7 @@ cf_regex_func=no
 cf_regex_libs="regex re"
 case $host_os in #(vi
 mingw*)
-       cf_regex_libs="regex.dll $cf_regex_libs"
+       cf_regex_libs="gnurx $cf_regex_libs"
        ;;
 esac
 
@@ -5626,7 +5702,7 @@ if test "$cf_cv_sizechange" != no ; then
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_SRC_MODULES version: 22 updated: 2011/10/22 14:58:07
+dnl CF_SRC_MODULES version: 26 updated: 2012/01/07 15:08:24
 dnl --------------
 dnl For each parameter, test if the source-directory exists, and if it contains
 dnl a 'modules' file.  If so, add to the list $cf_cv_src_modules which we'll
@@ -5649,6 +5725,7 @@ else
        TEST_ARG2="-l${LIB_NAME}${DFT_ARG_SUFFIX} $TEST_ARG2"
 fi
 
+PC_MODULES_TO_MAKE="ncurses${DFT_ARG_SUFFIX}"
 cf_cv_src_modules=
 for cf_dir in $1
 do
@@ -5687,6 +5764,7 @@ do
                                TEST_ARGS="-l${cf_dir}${DFT_ARG_SUFFIX} $TEST_ARGS"
                                TEST_ARG2="-l${cf_dir}${DFT_ARG_SUFFIX} $TEST_ARG2"
                        fi
+                       PC_MODULES_TO_MAKE="${PC_MODULES_TO_MAKE} ${cf_dir}${DFT_ARG_SUFFIX}"
                fi
        fi
 done
@@ -5714,7 +5792,15 @@ if test "x$cf_with_tests" != "xno" ; then
        SRC_SUBDIRS="$SRC_SUBDIRS test"
 fi
 test -z "$MAKE_TERMINFO" && SRC_SUBDIRS="$SRC_SUBDIRS misc"
-test "$cf_with_cxx_binding" != no && SRC_SUBDIRS="$SRC_SUBDIRS c++"
+if test "$cf_with_cxx_binding" != no; then
+       PC_MODULES_TO_MAKE="${PC_MODULES_TO_MAKE} ncurses++${DFT_ARG_SUFFIX}"
+       SRC_SUBDIRS="$SRC_SUBDIRS c++"
+fi
+
+test "x$with_termlib" != xno && PC_MODULES_TO_MAKE="$PC_MODULES_TO_MAKE $TINFO_ARG_SUFFIX"
+test "x$with_ticlib" != xno && PC_MODULES_TO_MAKE="$PC_MODULES_TO_MAKE $TICS_ARG_SUFFIX"
+
+AC_SUBST(PC_MODULES_TO_MAKE)
 
 ADA_SUBDIRS=
 if test "x$cf_with_ada" = "xyes" && test "x$cf_cv_prog_gnat_correct" = xyes && test -f $srcdir/Ada95/Makefile.in; then
@@ -5952,6 +6038,45 @@ top_builddir=`pwd`
 AC_SUBST(top_builddir)
 ])dnl
 dnl ---------------------------------------------------------------------------
+dnl CF_TRY_XOPEN_SOURCE version: 1 updated: 2011/10/30 17:09:50
+dnl -------------------
+dnl If _XOPEN_SOURCE is not defined in the compile environment, check if we
+dnl can define it successfully.
+AC_DEFUN([CF_TRY_XOPEN_SOURCE],[
+AC_CACHE_CHECK(if we should define _XOPEN_SOURCE,cf_cv_xopen_source,[
+       AC_TRY_COMPILE([
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+],[
+#ifndef _XOPEN_SOURCE
+make an error
+#endif],
+       [cf_cv_xopen_source=no],
+       [cf_save="$CPPFLAGS"
+        CPPFLAGS="$CPPFLAGS -D_XOPEN_SOURCE=$cf_XOPEN_SOURCE"
+        AC_TRY_COMPILE([
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+],[
+#ifdef _XOPEN_SOURCE
+make an error
+#endif],
+       [cf_cv_xopen_source=no],
+       [cf_cv_xopen_source=$cf_XOPEN_SOURCE])
+       CPPFLAGS="$cf_save"
+       ])
+])
+
+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)
+fi
+])
+dnl ---------------------------------------------------------------------------
 dnl CF_TYPEOF_CHTYPE version: 8 updated: 2006/12/16 12:33:30
 dnl ----------------
 dnl Determine the type we should use for chtype (and attr_t, which is treated
@@ -6540,11 +6665,11 @@ AC_SUBST($3)dnl
 
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_WITH_PKG_CONFIG_LIBDIR version: 1 updated: 2011/09/10 16:20:21
+dnl CF_WITH_PKG_CONFIG_LIBDIR version: 2 updated: 2011/12/10 18:58:47
 dnl -------------------------
 dnl Allow the choice of the pkg-config library directory to be overridden.
 AC_DEFUN([CF_WITH_PKG_CONFIG_LIBDIR],[
-if test "$PKG_CONFIG" != no ; then
+if test "$PKG_CONFIG" != none ; then
        AC_MSG_CHECKING(for $PKG_CONFIG library directory)
        AC_ARG_WITH(pkg-config-libdir,
                [  --with-pkg-config-libdir=XXX use given directory for installing pc-files],
@@ -6583,7 +6708,7 @@ fi
 AC_SUBST(PKG_CONFIG_LIBDIR)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_WITH_PTHREAD version: 3 updated: 2010/05/29 16:31:02
+dnl CF_WITH_PTHREAD version: 5 updated: 2011/12/10 19:01:56
 dnl ---------------
 dnl Check for POSIX thread library.
 AC_DEFUN([CF_WITH_PTHREAD],
@@ -6599,23 +6724,28 @@ if test "$with_pthread" != no ; then
     AC_CHECK_HEADER(pthread.h,[
         AC_DEFINE(HAVE_PTHREADS_H)
 
-        AC_MSG_CHECKING(if we can link with the pthread library)
-        cf_save_LIBS="$LIBS"
-        CF_ADD_LIB(pthread)
-        AC_TRY_LINK([
+       for cf_lib_pthread in pthread c_r
+       do
+           AC_MSG_CHECKING(if we can link with the $cf_lib_pthread library)
+           cf_save_LIBS="$LIBS"
+           CF_ADD_LIB($cf_lib_pthread)
+           AC_TRY_LINK([
 #include <pthread.h>
 ],[
-        int rc = pthread_create(0,0,0,0);
+               int rc = pthread_create(0,0,0,0);
+               int r2 = pthread_mutexattr_settype(0, 0);
 ],[with_pthread=yes],[with_pthread=no])
-        LIBS="$cf_save_LIBS"
-        AC_MSG_RESULT($with_pthread)
-
-        if test "$with_pthread" = yes ; then
-            CF_ADD_LIB(pthread)
-            AC_DEFINE(HAVE_LIBPTHREADS)
-        else
-            AC_MSG_ERROR(Cannot link with pthread library)
-        fi
+           LIBS="$cf_save_LIBS"
+           AC_MSG_RESULT($with_pthread)
+           test "$with_pthread" = yes && break
+       done
+
+       if test "$with_pthread" = yes ; then
+           CF_ADD_LIB($cf_lib_pthread)
+           AC_DEFINE(HAVE_LIBPTHREADS)
+       else
+           AC_MSG_ERROR(Cannot link with pthread library)
+       fi
     ])
 fi
 ])
@@ -6683,7 +6813,7 @@ CF_NO_LEAKS_OPTION(valgrind,
        [USE_VALGRIND])
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_XOPEN_SOURCE version: 37 updated: 2011/08/06 20:32:05
+dnl CF_XOPEN_SOURCE version: 42 updated: 2012/01/07 08:26:49
 dnl ---------------
 dnl Try to get _XOPEN_SOURCE defined properly that we can use POSIX functions,
 dnl or adapt to the vendor's definitions to get equivalent functionality,
@@ -6710,6 +6840,7 @@ darwin[[0-8]].*) #(vi
        ;;
 darwin*) #(vi
        cf_xopen_source="-D_DARWIN_C_SOURCE"
+       cf_XOPEN_SOURCE=
        ;;
 freebsd*|dragonfly*) #(vi
        # 5.x headers associate
@@ -6727,16 +6858,24 @@ hpux*) #(vi
        ;;
 irix[[56]].*) #(vi
        cf_xopen_source="-D_SGI_SOURCE"
+       cf_XOPEN_SOURCE=
        ;;
 linux*|gnu*|mint*|k*bsd*-gnu) #(vi
        CF_GNU_SOURCE
        ;;
 mirbsd*) #(vi
-       # setting _XOPEN_SOURCE or _POSIX_SOURCE breaks <arpa/inet.h>
+       # setting _XOPEN_SOURCE or _POSIX_SOURCE breaks <sys/select.h> and other headers which use u_int / u_short types
+       cf_XOPEN_SOURCE=
+       CF_POSIX_C_SOURCE($cf_POSIX_C_SOURCE)
        ;;
 netbsd*) #(vi
        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]]*) #(vi
+       # 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
+       ;;
 openbsd*) #(vi
        # setting _XOPEN_SOURCE breaks xterm on OpenBSD 2.8, is not needed for ncursesw
        ;;
@@ -6749,36 +6888,11 @@ nto-qnx*) #(vi
 sco*) #(vi
        # setting _XOPEN_SOURCE breaks Lynx on SCO Unix / OpenServer
        ;;
-solaris2.1[[0-9]]) #(vi
-       cf_xopen_source="-D__EXTENSIONS__ -D_XOPEN_SOURCE=$cf_XOPEN_SOURCE"
-       ;;
-solaris2.[[1-9]]) #(vi
+solaris2.*) #(vi
        cf_xopen_source="-D__EXTENSIONS__"
        ;;
 *)
-       AC_CACHE_CHECK(if we should define _XOPEN_SOURCE,cf_cv_xopen_source,[
-       AC_TRY_COMPILE([#include <sys/types.h>],[
-#ifndef _XOPEN_SOURCE
-make an error
-#endif],
-       [cf_cv_xopen_source=no],
-       [cf_save="$CPPFLAGS"
-        CPPFLAGS="$CPPFLAGS -D_XOPEN_SOURCE=$cf_XOPEN_SOURCE"
-        AC_TRY_COMPILE([#include <sys/types.h>],[
-#ifdef _XOPEN_SOURCE
-make an error
-#endif],
-       [cf_cv_xopen_source=no],
-       [cf_cv_xopen_source=$cf_XOPEN_SOURCE])
-       CPPFLAGS="$cf_save"
-       ])
-])
-       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($cf_temp_xopen_source)
-       fi
+       CF_TRY_XOPEN_SOURCE
        CF_POSIX_C_SOURCE($cf_POSIX_C_SOURCE)
        ;;
 esac
@@ -6786,4 +6900,33 @@ esac
 if test -n "$cf_xopen_source" ; then
        CF_ADD_CFLAGS($cf_xopen_source)
 fi
+
+dnl In anything but the default case, we may have system-specific setting
+dnl which is still not guaranteed to provide all of the entrypoints that
+dnl _XOPEN_SOURCE would yield.
+if test -n "$cf_XOPEN_SOURCE" && test -z "$cf_cv_xopen_source" ; then
+       AC_MSG_CHECKING(if _XOPEN_SOURCE really is set)
+       AC_TRY_COMPILE([#include <stdlib.h>],[
+#ifndef _XOPEN_SOURCE
+make an error
+#endif],
+       [cf_XOPEN_SOURCE_set=yes],
+       [cf_XOPEN_SOURCE_set=no])
+       AC_MSG_RESULT($cf_XOPEN_SOURCE_set)
+       if test $cf_XOPEN_SOURCE_set = yes
+       then
+               AC_TRY_COMPILE([#include <stdlib.h>],[
+#if (_XOPEN_SOURCE - 0) < $cf_XOPEN_SOURCE
+make an error
+#endif],
+               [cf_XOPEN_SOURCE_set_ok=yes],
+               [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
+       else
+               CF_TRY_XOPEN_SOURCE
+       fi
+fi
 ])