+fi
+
+CXXFLAGS="$CFLAGS"
+CFLAGS="$cf_save_CXXFLAGS"
+
+ NCURSES_CXX_IMPEXP="__attribute__ ((visibility(\"default\")))"
+ fi
+ ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS "conftest.$ac_ext" >&5'
+ac_link='$CC -o "conftest$ac_exeext" $CFLAGS $CPPFLAGS $LDFLAGS "conftest.$ac_ext" $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+ac_main_return="return"
+
+ fi
+fi
+
+### use option --enable-interop to turn on use of bindings used for interop
+echo "$as_me:16325: checking if you want interop bindings" >&5
+echo $ECHO_N "checking if you want interop bindings... $ECHO_C" >&6
+
+# Check whether --enable-interop or --disable-interop was given.
+if test "${enable_interop+set}" = set; then
+ enableval="$enable_interop"
+ with_exp_interop=$enableval
+else
+ with_exp_interop=$cf_dft_interop
+fi;
+echo "$as_me:16335: result: $with_exp_interop" >&5
+echo "${ECHO_T}$with_exp_interop" >&6
+
+NCURSES_INTEROP_FUNCS=0
+test "x$with_exp_interop" = xyes && NCURSES_INTEROP_FUNCS=1
+
+echo "$as_me:16341: checking if you want experimental safe-sprintf code" >&5
+echo $ECHO_N "checking if you want experimental safe-sprintf code... $ECHO_C" >&6
+
+# Check whether --enable-safe-sprintf or --disable-safe-sprintf was given.
+if test "${enable_safe_sprintf+set}" = set; then
+ enableval="$enable_safe_sprintf"
+ with_safe_sprintf=$enableval
+else
+ with_safe_sprintf=no
+fi;
+echo "$as_me:16351: result: $with_safe_sprintf" >&5
+echo "${ECHO_T}$with_safe_sprintf" >&6
+
+### use option --disable-scroll-hints to turn off use of scroll-hints scrolling logic
+# when hashmap is used scroll hints are useless
+if test "$with_hashmap" = no ; then
+echo "$as_me:16357: checking if you want to experiment without scrolling-hints code" >&5
+echo $ECHO_N "checking if you want to experiment without scrolling-hints code... $ECHO_C" >&6
+
+# Check whether --enable-scroll-hints or --disable-scroll-hints was given.
+if test "${enable_scroll_hints+set}" = set; then
+ enableval="$enable_scroll_hints"
+ with_scroll_hints=$enableval
+else
+ with_scroll_hints=yes
+fi;
+echo "$as_me:16367: result: $with_scroll_hints" >&5
+echo "${ECHO_T}$with_scroll_hints" >&6
+test "x$with_scroll_hints" = xyes &&
+cat >>confdefs.h <<\EOF
+#define USE_SCROLL_HINTS 1
+EOF
+
+fi
+
+echo "$as_me:16376: checking if you want wgetch-events code" >&5
+echo $ECHO_N "checking if you want wgetch-events code... $ECHO_C" >&6
+
+# Check whether --enable-wgetch-events or --disable-wgetch-events was given.
+if test "${enable_wgetch_events+set}" = set; then
+ enableval="$enable_wgetch_events"
+ with_wgetch_events=$enableval
+else
+ with_wgetch_events=no
+fi;
+echo "$as_me:16386: result: $with_wgetch_events" >&5
+echo "${ECHO_T}$with_wgetch_events" >&6
+if test "x$with_wgetch_events" = xyes ; then
+
+cat >>confdefs.h <<\EOF
+#define NCURSES_WGETCH_EVENTS 1
+EOF
+
+ NCURSES_WGETCH_EVENTS=1
+else
+ NCURSES_WGETCH_EVENTS=0
+fi
+
+case "$cf_cv_system_name" in
+(*mingw32*|*mingw64*|*-msvc*)
+ echo "$as_me:16401: checking if you want experimental-Windows driver" >&5
+echo $ECHO_N "checking if you want experimental-Windows driver... $ECHO_C" >&6
+
+# Check whether --enable-exp-win32 or --disable-exp-win32 was given.
+if test "${enable_exp_win32+set}" = set; then
+ enableval="$enable_exp_win32"
+ with_exp_win32=$enableval
+else
+ with_exp_win32=no
+fi;
+ echo "$as_me:16411: result: $with_exp_win32" >&5
+echo "${ECHO_T}$with_exp_win32" >&6
+ if test "x$with_exp_win32" = xyes
+ then
+
+cat >>confdefs.h <<\EOF
+#define EXP_WIN32_DRIVER 1
+EOF
+
+ EXP_WIN32_DRIVER=1
+ INTERNALS_HDR='$(INCDIR)/nc_win32.h'
+ else
+ INTERNALS_HDR='$(INCDIR)/nc_mingw.h'
+ EXP_WIN32_DRIVER=0
+ fi
+ ;;
+(*)
+ EXP_WIN32_DRIVER=0
+ INTERNALS_HDR=
+ ;;
+esac
+
+###############################################################################
+
+### use option --disable-echo to suppress full display compiling commands
+
+echo "$as_me:16437: checking if you want to see long compiling messages" >&5
+echo $ECHO_N "checking if you want to see long compiling messages... $ECHO_C" >&6
+
+# Check whether --enable-echo or --disable-echo was given.
+if test "${enable_echo+set}" = set; then
+ enableval="$enable_echo"
+ test "$enableval" != no && enableval=yes
+ if test "$enableval" != "yes" ; then
+
+ ECHO_LT='--silent'
+ ECHO_LD='@echo linking $@;'
+ RULE_CC='@echo compiling $<'
+ SHOW_CC='@echo compiling $@'
+ ECHO_CC='@'
+
+ else
+
+ ECHO_LT=''
+ ECHO_LD=''
+ RULE_CC=''
+ SHOW_CC=''
+ ECHO_CC=''
+
+ fi
+else
+ enableval=yes
+
+ ECHO_LT=''
+ ECHO_LD=''
+ RULE_CC=''
+ SHOW_CC=''
+ ECHO_CC=''
+
+fi;
+echo "$as_me:16471: result: $enableval" >&5
+echo "${ECHO_T}$enableval" >&6
+
+if test "x$enable_echo" = xyes; then
+ ECHO_LINK=
+else
+ ECHO_LINK='@ echo linking $@ ... ;'
+ test -n "$LIBTOOL" && LIBTOOL="$LIBTOOL --silent"
+ test -n "$LIBTOOL_CXX" && LIBTOOL_CXX="$LIBTOOL_CXX --silent"
+fi
+
+# --disable-stripping is used for debugging
+
+echo "$as_me:16484: checking if you want to install stripped executables" >&5
+echo $ECHO_N "checking if you want to install stripped executables... $ECHO_C" >&6
+
+# Check whether --enable-stripping or --disable-stripping was given.
+if test "${enable_stripping+set}" = set; then
+ enableval="$enable_stripping"
+ test "$enableval" != no && enableval=yes
+ if test "$enableval" != "yes" ; then
+ enable_stripping=no
+ else
+ enable_stripping=yes
+ fi
+else
+ enableval=yes
+ enable_stripping=yes
+
+fi;
+echo "$as_me:16501: result: $enable_stripping" >&5
+echo "${ECHO_T}$enable_stripping" >&6
+
+if test "$enable_stripping" = yes
+then
+ INSTALL_OPT_S="-s"
+else
+ INSTALL_OPT_S=
+fi
+
+: "${INSTALL:=install}"
+echo "$as_me:16512: checking if install accepts -p option" >&5
+echo $ECHO_N "checking if install accepts -p option... $ECHO_C" >&6
+if test "${cf_cv_install_p+set}" = set; then
+ echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+
+ rm -rf ./conftest*
+ date >conftest.in
+ mkdir conftest.out
+ sleep 3
+ if $INSTALL -p conftest.in conftest.out 2>/dev/null
+ then
+ if test -f conftest.out/conftest.in
+ then
+ test conftest.in -nt conftest.out/conftest.in 2>conftest.err && \
+ test conftest.out/conftest.in -nt conftest.in 2>conftest.err
+ if test -s conftest.err
+ then
+ cf_cv_install_p=no
+ else
+ cf_cv_install_p=yes
+ fi
+ else
+ cf_cv_install_p=no
+ fi
+ else
+ cf_cv_install_p=no
+ fi
+ rm -rf ./conftest*
+
+fi
+echo "$as_me:16543: result: $cf_cv_install_p" >&5
+echo "${ECHO_T}$cf_cv_install_p" >&6
+
+echo "$as_me:16546: checking if install needs to be told about ownership" >&5
+echo $ECHO_N "checking if install needs to be told about ownership... $ECHO_C" >&6
+case `$ac_config_guess` in
+(*minix)
+ with_install_o=yes
+ ;;
+(*)
+ with_install_o=no
+ ;;
+esac
+
+echo "$as_me:16557: result: $with_install_o" >&5
+echo "${ECHO_T}$with_install_o" >&6
+if test "x$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
+
+# If we're avoiding relinking of shared libraries during install, that is to
+# avoid modifying the build-tree. For the same reason, avoid doing ranlib if
+# the install program has "-p" (for preserving timestamps).
+cf_cv_do_reranlib=yes
+if test "x$cf_cv_install_p" = xyes
+then
+ if test "x$cf_cv_do_relink" != xyes
+ then
+ cf_cv_do_reranlib=no
+ INSTALL_OPT_P="-p"
+ INSTALL_LIB="$INSTALL_LIB $INSTALL_OPT_P"
+ fi
+fi
+
+### use option --enable-warnings to turn on all gcc warnings
+
+echo "$as_me:16582: checking if you want to use C11 _Noreturn feature" >&5
+echo $ECHO_N "checking if you want to use C11 _Noreturn feature... $ECHO_C" >&6
+
+# Check whether --enable-stdnoreturn or --disable-stdnoreturn was given.
+if test "${enable_stdnoreturn+set}" = set; then
+ enableval="$enable_stdnoreturn"
+ test "$enableval" != yes && enableval=no
+ if test "$enableval" != "no" ; then
+ enable_stdnoreturn=yes
+ else
+ enable_stdnoreturn=no
+ fi
+else
+ enableval=no
+ enable_stdnoreturn=no
+
+fi;
+echo "$as_me:16599: result: $enable_stdnoreturn" >&5
+echo "${ECHO_T}$enable_stdnoreturn" >&6
+
+if test $enable_stdnoreturn = yes; then
+echo "$as_me:16603: checking for C11 _Noreturn feature" >&5
+echo $ECHO_N "checking for C11 _Noreturn feature... $ECHO_C" >&6
+if test "${cf_cv_c11_noreturn+set}" = set; then
+ echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+ cat >"conftest.$ac_ext" <<_ACEOF
+#line 16609 "configure"