libncurses: Import https://ftp.gnu.org/pub/gnu/ncurses/ncurses-6.5.tar.gz changes

Change-Id: I3433d30ca01359fd2e3623ede96b531f0b39cbfa
Signed-off-by: micky387 <mickaelsaibi@free.fr>
diff --git a/test/aclocal.m4 b/test/aclocal.m4
index 0ea83b5..fdab359 100644
--- a/test/aclocal.m4
+++ b/test/aclocal.m4
@@ -1,5 +1,6 @@
 dnl***************************************************************************
-dnl Copyright (c) 2003-2014,2015 Free Software Foundation, Inc.              *
+dnl Copyright 2018-2023,2024 Thomas E. Dickey                                *
+dnl Copyright 2003-2017,2018 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            *
@@ -26,7 +27,7 @@
 dnl authorization.                                                           *
 dnl***************************************************************************
 dnl
-dnl $Id: aclocal.m4,v 1.120 2015/08/08 14:27:27 tom Exp $
+dnl $Id: aclocal.m4,v 1.221 2024/01/19 18:27:20 tom Exp $
 dnl
 dnl Author: Thomas E. Dickey
 dnl
@@ -36,10 +37,37 @@
 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 ---------------------------------------------------------------------------
+dnl AM_LANGINFO_CODESET version: 7 updated: 2023/01/11 04:05:23
+dnl -------------------
+dnl Inserted as requested by gettext 0.10.40
+dnl File from /usr/share/aclocal
+dnl codeset.m4
+dnl ====================
+dnl serial AM1
+dnl
+dnl From Bruno Haible.
+AC_DEFUN([AM_LANGINFO_CODESET],
+[
+AC_CACHE_CHECK([for nl_langinfo and CODESET], am_cv_langinfo_codeset,
+	[AC_TRY_LINK([
+$ac_includes_default
+#include <langinfo.h>],
+	[char* cs = nl_langinfo(CODESET); (void)cs],
+	am_cv_langinfo_codeset=yes,
+	am_cv_langinfo_codeset=no)
+	])
+	if test "$am_cv_langinfo_codeset" = yes; then
+		AC_DEFINE(HAVE_LANGINFO_CODESET, 1,
+		[Define if you have <langinfo.h> and nl_langinfo(CODESET).])
+	fi
+])dnl
+dnl ---------------------------------------------------------------------------
 dnl CF_ACVERSION_CHECK version: 5 updated: 2014/06/04 19:11:49
 dnl ------------------
 dnl Conditionally generate script according to whether we're using a given autoconf.
@@ -66,10 +94,11 @@
 [ifelse([$8], , ,[$8])],
 [ifelse([$9], , ,[$9])])])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
@@ -83,23 +112,23 @@
 
 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
 			;;
@@ -108,25 +137,25 @@
 		(*$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}" \
@@ -137,26 +166,26 @@
 
 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
@@ -166,9 +195,9 @@
 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
@@ -185,7 +214,7 @@
 			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")],
 				  [],
@@ -199,7 +228,7 @@
 		  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
@@ -221,7 +250,7 @@
 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
@@ -235,9 +264,9 @@
 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
@@ -257,7 +286,7 @@
 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
@@ -266,19 +295,19 @@
 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
@@ -296,7 +325,7 @@
 CF_VERBOSE(...after  $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
@@ -308,16 +337,45 @@
 [
 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}$2"
+])dnl
+dnl ---------------------------------------------------------------------------
 dnl CF_ARG_DISABLE version: 3 updated: 1999/03/30 17:24:31
 dnl --------------
 dnl Allow user to disable a normally-on option.
@@ -353,25 +411,101 @@
 ])dnl
 ])])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_CC_ENV_FLAGS version: 2 updated: 2015/04/12 15:39:00
+dnl CF_C11_NORETURN version: 4 updated: 2023/02/18 17:41:25
+dnl ---------------
+AC_DEFUN([CF_C11_NORETURN],
+[
+AC_MSG_CHECKING(if you want to use C11 _Noreturn feature)
+CF_ARG_ENABLE(stdnoreturn,
+	[  --enable-stdnoreturn    enable C11 _Noreturn feature for diagnostics],
+	[enable_stdnoreturn=yes],
+	[enable_stdnoreturn=no])
+AC_MSG_RESULT($enable_stdnoreturn)
+
+if test $enable_stdnoreturn = yes; then
+AC_CACHE_CHECK([for C11 _Noreturn feature], cf_cv_c11_noreturn,
+	[AC_TRY_COMPILE([
+$ac_includes_default
+#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: 11 updated: 2023/02/20 11:15:46
 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.
+dnl
+dnl Caveat: this also disallows blanks in the pathname for the compiler, but
+dnl the nuisance of having inconsistent settings for compiler and preprocessor
+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 "$CC" in
-(*[[\ \	]]-[[IUD]]*)
+(*[[\ \	]]-*)
 	AC_MSG_RESULT(broken)
-	AC_MSG_WARN(your environment misuses the CC variable to hold CFLAGS/CPPFLAGS options)
+	AC_MSG_WARN(your environment uses the CC variable to hold CFLAGS/CPPFLAGS options)
 	# humor him...
-	cf_flags=`echo "$CC" | sed -e 's/^[[^ 	]]*[[ 	]]//'`
-	CC=`echo "$CC" | sed -e 's/[[ 	]].*//'`
-	CF_ADD_CFLAGS($cf_flags)
+	cf_prog=`echo "$CC" | sed -e 's/	/ /g' -e 's/[[ ]]* / /g' -e 's/[[ ]]*[[ ]]-[[^ ]].*//'`
+	cf_flags=`echo "$CC" | sed -e "s%^$cf_prog%%"`
+	CC="$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')
 	;;
 (*)
 	AC_MSG_RESULT(ok)
@@ -379,7 +513,7 @@
 esac
 ])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.
@@ -393,7 +527,7 @@
 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
@@ -414,7 +548,7 @@
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_CHECK_CFLAGS version: 3 updated: 2014/07/22 05:32:57
+dnl CF_CHECK_CFLAGS version: 4 updated: 2021/01/02 19:22:58
 dnl ---------------
 dnl Conditionally add to $CFLAGS and $CPPFLAGS values which are derived from
 dnl a build-configuration such as imake.  These have the pitfall that they
@@ -432,24 +566,70 @@
 	 if test "x$cf_check_cppflags" != "x$CPPFLAGS" ; then
 		 CF_VERBOSE(but keeping change to \$CPPFLAGS)
 	 fi
-	 CFLAGS="$cf_check_flags"])
+	 CFLAGS="$cf_check_cflags"])
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_CHECK_CURSES_LIB version: 1 updated: 2015/04/25 20:53:11
+dnl CF_CHECK_CURSES_LIB version: 4 updated: 2021/09/05 17:25:40
 dnl -------------------
 dnl $1 = nominal library name, used also for header lookup
 dnl $2 = suffix to append to library name
 dnl $3 = function to check for using AC_CHECK_LIB
+dnl $4 = optional parameter list for $3
 AC_DEFUN([CF_CHECK_CURSES_LIB],
 [
-AC_CHECK_LIB($1$2,$3,[
-CF_UPPER(cf_upper,have_lib$1)
-CF_ADD_LIBS(-l$1$2)
-AC_DEFINE_UNQUOTED($cf_upper,1)])
+AC_REQUIRE([CF_PKG_CONFIG])
+
+cf_have_curses_lib=no
+
+: ${NCURSES_CONFIG_PKG:=none}
+if test "x${NCURSES_CONFIG_PKG}" = xnone; then
+	:
+elif test "x${PKG_CONFIG:=none}" != xnone; then
+	AC_MSG_CHECKING(pkg-config for $1$2)
+	if "$PKG_CONFIG" --exists "$1$2" ; then
+		AC_MSG_RESULT(yes)
+
+		AC_MSG_CHECKING(if the $1$2 package files work)
+
+		cf_save_CFLAGS="$CFLAGS"
+		cf_save_CPPFLAGS="$CPPFLAGS"
+		cf_save_LIBS="$LIBS"
+
+		CF_APPEND_CFLAGS(`$PKG_CONFIG --cflags "$1$2"`)
+		CF_ADD_LIBS(`$PKG_CONFIG --libs "$1$2"`)
+
+		AC_TRY_LINK([#include <$1.h>],
+			[(void) $3 ( ]ifelse([$4],,,[[$4]])[ );],
+			[AC_TRY_RUN([#include <$1.h>
+				int main(void)
+				{ (void) $3 ( ]ifelse([$4],,,[[$4]])[ ); return 0; }],
+				[cf_have_curses_lib=yes],
+				[cf_have_curses_lib=no],
+				[cf_have_curses_lib=maybe])],
+			[cf_have_curses_lib=no])
+		AC_MSG_RESULT($cf_have_curses_lib)
+		test "$cf_have_curses_lib" = maybe && cf_have_curses_lib=yes
+		if test "$cf_have_curses_lib" = "yes"
+		then
+			CF_UPPER(cf_upper,have_lib$1)
+			AC_DEFINE_UNQUOTED($cf_upper,1)
+		else
+			CFLAGS="$cf_save_CFLAGS"
+			CPPFLAGS="$cf_save_CPPFLAGS"
+			LIBS="$cf_save_LIBS"
+		fi
+	fi
+fi
+if test "$cf_have_curses_lib" = no; then
+	AC_CHECK_LIB($1$2,$3,[
+		CF_UPPER(cf_upper,have_lib$1)
+		CF_ADD_LIBS(-l$1$2)
+		AC_DEFINE_UNQUOTED($cf_upper,1)])
+fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_CLANG_COMPILER version: 2 updated: 2013/11/19 19:23:35
+dnl CF_CLANG_COMPILER version: 9 updated: 2023/02/18 17:41:25
 dnl -----------------
 dnl Check if the given compiler is really clang.  clang's C driver defines
 dnl __GNUC__ (fooling the configure script into setting $GCC to yes) but does
@@ -468,21 +648,117 @@
 if test "$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
+#error __clang__ is not defined
 #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_CURSES_ACS_MAP version: 7 updated: 2012/10/06 16:39:58
+dnl CF_CONST_X_STRING version: 8 updated: 2023/12/01 17:22:50
+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(
+		[
+#undef  _CONST_X_STRING
+#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 "$cf_cv_const_x_string" in
+(no)
+	CF_APPEND_TEXT(CPPFLAGS,-DXTSTRINGDEFINES)
+	;;
+(*)
+	CF_APPEND_TEXT(CPPFLAGS,-D_CONST_X_STRING)
+	;;
+esac
+
+])
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_CURSES_ACS_MAP version: 8 updated: 2021/01/04 19:45:09
 dnl -----------------
 dnl Check for likely values of acs_map[]:
 AC_DEFUN([CF_CURSES_ACS_MAP],
@@ -495,7 +771,7 @@
 AC_TRY_LINK([
 #include <${cf_cv_ncurses_header:-curses.h}>
 ],[
-$name['k'] = ACS_PLUS
+${name}['k'] = ACS_PLUS
 ],[cf_cv_curses_acs_map=$name; break])
 done
 ])
@@ -503,53 +779,61 @@
 test "$cf_cv_curses_acs_map" != unknown && AC_DEFINE_UNQUOTED(CURSES_ACS_ARRAY,$cf_cv_curses_acs_map,[Define as needed to override ncurses prefix _nc_])
 ])
 dnl ---------------------------------------------------------------------------
-dnl CF_CURSES_CHECK_DATA version: 5 updated: 2014/07/19 18:41:17
+dnl CF_CURSES_CHECK_DATA version: 10 updated: 2021/01/04 19:45:09
 dnl --------------------
 dnl Check if curses.h defines the given data/variable.
 dnl Use this after CF_NCURSES_CONFIG or CF_CURSES_CONFIG.
+dnl
+dnl $1 = data item(s) to check for
+dnl $2 = action on success, e.g., "break" to quit checking a series of choices
 AC_DEFUN([CF_CURSES_CHECK_DATA],
 [
-AC_MSG_CHECKING(for data $1 declaration in ${cf_cv_ncurses_header:-curses.h})
+for cf_data in $1
+do
+AC_MSG_CHECKING(for data $cf_data declaration in ${cf_cv_ncurses_header:-curses.h})
 
-AC_TRY_COMPILE(CF__CURSES_HEAD,[
-void *foo = &($1)
-],cf_result=yes,cf_result=no)
+AC_TRY_COMPILE(CF__CURSES_HEAD,
+CF__CURSES_DATA(foo,$cf_data)
+,[cf_result=yes
+],[cf_result=no])
 AC_MSG_RESULT($cf_result)
 
-if test $cf_result = yes ; then
-	CF_UPPER(cf_result,have_curses_data_$1)
+if test "$cf_result" = yes ; then
+	CF_UPPER(cf_result,have_curses_data_$cf_data)
 	AC_DEFINE_UNQUOTED($cf_result)
+	ifelse($2,,,[$2])
 else
-	AC_MSG_CHECKING(for data $1 in library)
+	AC_MSG_CHECKING(for data $cf_data in library)
 	# BSD linkers insist on making weak linkage, but resolve at runtime.
 	AC_TRY_RUN(CF__CURSES_HEAD
 [
-extern char $1;
+extern char $cf_data;
 int main(void)
 {
-	void *foo = &($1);
-	fprintf(stderr, "testing linkage of $1:%p\n", foo);
+	]CF__CURSES_DATA(foo,$cf_data)[
 	${cf_cv_main_return:-return}(foo == 0);
-}],[cf_result=yes],[cf_result=no],[
+}],[cf_result=yes
+],[cf_result=no],[
 	# cross-compiling
 	AC_TRY_LINK(CF__CURSES_HEAD
-[extern char $1;],[
+[extern char $cf_data;],[
 	do {
-		void *foo = &($1);
-		fprintf(stderr, "testing linkage of $1:%p\n", foo);
+		]CF__CURSES_DATA(foo,$cf_data)[
 		${cf_cv_main_return:-return}(foo == 0);
 	} while (0)
 ],[cf_result=yes],[cf_result=no])
 ])
 	AC_MSG_RESULT($cf_result)
-	if test $cf_result = yes ; then
-		CF_UPPER(cf_result,decl_curses_data_$1)
+	if test "$cf_result" = yes ; then
+		CF_UPPER(cf_result,decl_curses_data_$cf_data)
 		AC_DEFINE_UNQUOTED($cf_result)
+		# do not exit loop here, since we prefer system's declarations
 	fi
 fi
+done
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_CURSES_CHECK_TYPE version: 4 updated: 2012/10/06 16:39:58
+dnl CF_CURSES_CHECK_TYPE version: 5 updated: 2021/01/04 19:45:09
 dnl --------------------
 dnl Check if curses.h defines the given type
 AC_DEFUN([CF_CURSES_CHECK_TYPE],
@@ -563,7 +847,7 @@
 $1 foo
 ],cf_result=yes,cf_result=no)
 AC_MSG_RESULT($cf_result)
-if test $cf_result = yes ; then
+if test "$cf_result" = yes ; then
 	CF_UPPER(cf_result,have_type_$1)
 	AC_DEFINE_UNQUOTED($cf_result,1,[Define to 1 if we have type $1])
 else
@@ -583,14 +867,14 @@
 CF_CURSES_LIBS
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_CURSES_CPPFLAGS version: 12 updated: 2015/04/15 19:08:48
+dnl CF_CURSES_CPPFLAGS version: 14 updated: 2021/01/02 09:31:20
 dnl ------------------
 dnl Look for the curses headers.
 AC_DEFUN([CF_CURSES_CPPFLAGS],[
 
 AC_CACHE_CHECK(for extra include directories,cf_cv_curses_incdir,[
 cf_cv_curses_incdir=no
-case $host_os in
+case "$host_os" in
 (hpux10.*)
 	if test "x$cf_cv_screen" = "xcurses_colr"
 	then
@@ -608,13 +892,16 @@
 	;;
 esac
 ])
-test "$cf_cv_curses_incdir" != no && CPPFLAGS="$CPPFLAGS $cf_cv_curses_incdir"
+if test "$cf_cv_curses_incdir" != no
+then
+	CF_APPEND_TEXT(CPPFLAGS,$cf_cv_curses_incdir)
+fi
 
 CF_CURSES_HEADER
 CF_TERM_HEADER
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_CURSES_FUNCS version: 18 updated: 2014/07/19 18:44:41
+dnl CF_CURSES_FUNCS version: 20 updated: 2020/12/31 20:19:42
 dnl ---------------
 dnl Curses-functions are a little complicated, since a lot of them are macros.
 AC_DEFUN([CF_CURSES_FUNCS],
@@ -635,26 +922,26 @@
 			[
 #ifndef ${cf_func}
 long foo = (long)(&${cf_func});
-fprintf(stderr, "testing linkage of $cf_func:%p\n", foo);
-if (foo + 1234 > 5678)
-	${cf_cv_main_return:-return}(foo);
+fprintf(stderr, "testing linkage of $cf_func:%p\\n", (void *)foo);
+if (foo + 1234L > 5678L)
+	${cf_cv_main_return:-return}(foo != 0);
 #endif
 			],
 			[cf_result=yes],
 			[cf_result=no])
 		fi
-		eval 'cf_cv_func_'$cf_func'=$cf_result'
+		eval 'cf_cv_func_'$cf_func'="$cf_result"'
 	])
 	# use the computed/retrieved cache-value:
 	eval 'cf_result=$cf_cv_func_'$cf_func
 	AC_MSG_RESULT($cf_result)
-	if test $cf_result != no; then
+	if test "$cf_result" != no; then
 		AC_DEFINE_UNQUOTED(HAVE_${cf_tr_func})
 	fi
 done
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_CURSES_HEADER version: 5 updated: 2015/04/23 20:35:30
+dnl CF_CURSES_HEADER version: 6 updated: 2022/12/02 20:06:52
 dnl ----------------
 dnl Find a "curses" header file, e.g,. "curses.h", or one of the more common
 dnl variations of ncurses' installs.
@@ -668,7 +955,7 @@
 	curses.h ifelse($1,,,[$1/curses.h]) ifelse($1,,[ncurses/ncurses.h ncurses/curses.h])
 do
 AC_TRY_COMPILE([#include <${cf_header}>],
-	[initscr(); tgoto("?", 0,0)],
+	[initscr(); endwin()],
 	[cf_cv_ncurses_header=$cf_header; break],[])
 done
 ])
@@ -681,7 +968,7 @@
 AC_CHECK_HEADERS($cf_cv_ncurses_header)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_CURSES_LIBS version: 39 updated: 2015/05/10 19:52:14
+dnl CF_CURSES_LIBS version: 45 updated: 2022/12/02 20:06:52
 dnl --------------
 dnl Look for the curses libraries.  Older curses implementations may require
 dnl termcap/termlib to be linked as well.  Call CF_CURSES_CPPFLAGS first.
@@ -690,13 +977,13 @@
 AC_REQUIRE([CF_CURSES_CPPFLAGS])dnl
 AC_MSG_CHECKING(if we have identified curses libraries)
 AC_TRY_LINK([#include <${cf_cv_ncurses_header:-curses.h}>],
-	[initscr(); tgoto("?", 0,0)],
+	[initscr(); endwin()],
 	cf_result=yes,
 	cf_result=no)
 AC_MSG_RESULT($cf_result)
 
 if test "$cf_result" = no ; then
-case $host_os in
+case "$host_os" in
 (freebsd*)
 	AC_CHECK_LIB(mytinfo,tgoto,[CF_ADD_LIBS(-lmytinfo)])
 	;;
@@ -714,7 +1001,7 @@
 		AC_CHECK_LIB(Hcurses,initscr,[
 			# HP's header uses __HP_CURSES, but user claims _HP_CURSES.
 			CF_ADD_LIBS(-lHcurses)
-			CPPFLAGS="$CPPFLAGS -D__HP_CURSES -D_HP_CURSES"
+			CF_APPEND_TEXT(CPPFLAGS,-D__HP_CURSES -D_HP_CURSES)
 			ac_cv_func_initscr=yes
 			])])
 	fi
@@ -763,7 +1050,10 @@
 		AC_CHECK_FUNC(tgoto,[cf_term_lib=predefined],[
 			for cf_term_lib in $cf_check_list otermcap termcap tinfo termlib unknown
 			do
-				AC_CHECK_LIB($cf_term_lib,tgoto,[break])
+				AC_CHECK_LIB($cf_term_lib,tgoto,[
+					: "${cf_nculib_root:=$cf_term_lib}"
+					break
+				])
 			done
 		])
 	fi
@@ -774,42 +1064,41 @@
 	then
 		for cf_curs_lib in $cf_check_list xcurses jcurses pdcurses unknown
 		do
-			AC_CHECK_LIB($cf_curs_lib,initscr,[break])
+			LIBS="-l$cf_curs_lib $cf_save_LIBS"
+			if test "$cf_term_lib" = unknown || test "$cf_term_lib" = "$cf_curs_lib" ; then
+				AC_MSG_CHECKING(if we can link with $cf_curs_lib library)
+				AC_TRY_LINK([#include <${cf_cv_ncurses_header:-curses.h}>],
+					[initscr()],
+					[cf_result=yes],
+					[cf_result=no])
+				AC_MSG_RESULT($cf_result)
+				test "$cf_result" = yes && break
+			elif test "$cf_curs_lib" = "$cf_term_lib" ; then
+				cf_result=no
+			elif test "$cf_term_lib" != predefined ; then
+				AC_MSG_CHECKING(if we need both $cf_curs_lib and $cf_term_lib libraries)
+				AC_TRY_LINK([#include <${cf_cv_ncurses_header:-curses.h}>],
+					[initscr(); endwin();],
+					[cf_result=no],
+					[
+					LIBS="-l$cf_curs_lib -l$cf_term_lib $cf_save_LIBS"
+					AC_TRY_LINK([#include <${cf_cv_ncurses_header:-curses.h}>],
+						[initscr()],
+						[cf_result=yes],
+						[cf_result=error])
+					])
+				AC_MSG_RESULT($cf_result)
+				test "$cf_result" != error && break
+			fi
 		done
 	fi
-	test $cf_curs_lib = unknown && AC_MSG_ERROR(no curses library found)
-
-	LIBS="-l$cf_curs_lib $cf_save_LIBS"
-	if test "$cf_term_lib" = unknown ; then
-		AC_MSG_CHECKING(if we can link with $cf_curs_lib library)
-		AC_TRY_LINK([#include <${cf_cv_ncurses_header:-curses.h}>],
-			[initscr()],
-			[cf_result=yes],
-			[cf_result=no])
-		AC_MSG_RESULT($cf_result)
-		test $cf_result = no && AC_MSG_ERROR(Cannot link curses library)
-	elif test "$cf_curs_lib" = "$cf_term_lib" ; then
-		:
-	elif test "$cf_term_lib" != predefined ; then
-		AC_MSG_CHECKING(if we need both $cf_curs_lib and $cf_term_lib libraries)
-		AC_TRY_LINK([#include <${cf_cv_ncurses_header:-curses.h}>],
-			[initscr(); tgoto((char *)0, 0, 0);],
-			[cf_result=no],
-			[
-			LIBS="-l$cf_curs_lib -l$cf_term_lib $cf_save_LIBS"
-			AC_TRY_LINK([#include <${cf_cv_ncurses_header:-curses.h}>],
-				[initscr()],
-				[cf_result=yes],
-				[cf_result=error])
-			])
-		AC_MSG_RESULT($cf_result)
-	fi
+	test "$cf_curs_lib" = unknown && AC_MSG_ERROR(no curses library found)
 fi
 fi
 
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_CURSES_TERM_H version: 11 updated: 2015/04/15 19:08:48
+dnl CF_CURSES_TERM_H version: 16 updated: 2024/01/07 06:34:16
 dnl ----------------
 dnl SVr4 curses should have term.h as well (where it puts the definitions of
 dnl the low-level interface).  This may not be true in old/broken implementations,
@@ -826,9 +1115,9 @@
 
 cf_header_list="term.h ncurses/term.h ncursesw/term.h"
 
-case ${cf_cv_ncurses_header:-curses.h} in
+case "${cf_cv_ncurses_header:-curses.h}" in
 (*/*)
-	cf_header_item=`echo ${cf_cv_ncurses_header:-curses.h} | sed -e 's%\..*%%' -e 's%/.*%/%'`term.h
+	cf_header_item=`echo "${cf_cv_ncurses_header:-curses.h}" | sed -e 's%\..*%%' -e 's%/.*%/%'`term.h
 	cf_header_list="$cf_header_item $cf_header_list"
 	;;
 esac
@@ -838,13 +1127,13 @@
 	AC_TRY_COMPILE([
 #include <${cf_cv_ncurses_header:-curses.h}>
 #include <${cf_header}>],
-	[WINDOW *x],
+	[WINDOW *x; (void)x],
 	[cf_cv_term_header=$cf_header
 	 break],
 	[cf_cv_term_header=no])
 done
 
-case $cf_cv_term_header in
+case "$cf_cv_term_header" in
 (no)
 	# If curses is ncurses, some packagers still mess it up by trying to make
 	# us use GNU termcap.  This handles the most common case.
@@ -855,9 +1144,9 @@
 #ifdef NCURSES_VERSION
 #include <${cf_header}>
 #else
-make an error
+#error expected NCURSES_VERSION to be defined
 #endif],
-			[WINDOW *x],
+			[WINDOW *x; (void)x],
 			[cf_cv_term_header=$cf_header
 			 break],
 			[cf_cv_term_header=no])
@@ -866,7 +1155,7 @@
 esac
 ])
 
-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])
 	;;
@@ -879,7 +1168,7 @@
 esac
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_CURSES_UNCTRL_H version: 4 updated: 2015/04/15 19:08:48
+dnl CF_CURSES_UNCTRL_H version: 8 updated: 2021/01/02 09:31:20
 dnl ------------------
 dnl Any X/Open curses implementation must have unctrl.h, but ncurses packages
 dnl may put it in a subdirectory (along with ncurses' other headers, of
@@ -896,9 +1185,9 @@
 
 cf_header_list="unctrl.h ncurses/unctrl.h ncursesw/unctrl.h"
 
-case ${cf_cv_ncurses_header:-curses.h} in
+case "${cf_cv_ncurses_header:-curses.h}" in
 (*/*)
-	cf_header_item=`echo ${cf_cv_ncurses_header:-curses.h} | sed -e 's%\..*%%' -e 's%/.*%/%'`unctrl.h
+	cf_header_item=`echo "${cf_cv_ncurses_header:-curses.h}" | sed -e 's%\..*%%' -e 's%/.*%/%'`unctrl.h
 	cf_header_list="$cf_header_item $cf_header_list"
 	;;
 esac
@@ -908,20 +1197,20 @@
 	AC_TRY_COMPILE([
 #include <${cf_cv_ncurses_header:-curses.h}>
 #include <${cf_header}>],
-	[WINDOW *x],
+	[WINDOW *x; (void)x],
 	[cf_cv_unctrl_header=$cf_header
 	 break],
 	[cf_cv_unctrl_header=no])
 done
 ])
 
-case $cf_cv_unctrl_header in
+case "$cf_cv_unctrl_header" in
 (no)
 	AC_MSG_WARN(unctrl.h header not found)
 	;;
 esac
 
-case $cf_cv_unctrl_header in
+case "$cf_cv_unctrl_header" in
 (unctrl.h)
 	AC_DEFINE(HAVE_UNCTRL_H,1,[Define to 1 if we have unctrl.h])
 	;;
@@ -934,7 +1223,7 @@
 esac
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_CURSES_WACS_MAP version: 6 updated: 2012/10/06 08:57:51
+dnl CF_CURSES_WACS_MAP version: 8 updated: 2021/01/04 19:45:09
 dnl ------------------
 dnl Check for likely values of wacs_map[].
 AC_DEFUN([CF_CURSES_WACS_MAP],
@@ -948,7 +1237,7 @@
 #define _XOPEN_SOURCE_EXTENDED
 #endif
 #include <${cf_cv_ncurses_header:-curses.h}>],
-	[void *foo = &($name['k'])],
+	[void *foo = &(${name}['k']); (void)foo],
 	[cf_cv_curses_wacs_map=$name
 	 break])
 	done])
@@ -956,7 +1245,7 @@
 test "$cf_cv_curses_wacs_map" != unknown && AC_DEFINE_UNQUOTED(CURSES_WACS_ARRAY,$cf_cv_curses_wacs_map,[Define to name of (n)curses wide-character array])
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_CURSES_WACS_SYMBOLS version: 2 updated: 2012/10/06 08:57:51
+dnl CF_CURSES_WACS_SYMBOLS version: 4 updated: 2021/01/04 19:45:09
 dnl ----------------------
 dnl Do a check to see if the WACS_xxx constants are defined compatibly with
 dnl X/Open Curses.  In particular, NetBSD's implementation of the WACS_xxx
@@ -975,7 +1264,7 @@
 #endif
 #include <${cf_cv_ncurses_header:-curses.h}>],
 	[cchar_t *foo = WACS_PLUS;
-	 $cf_cv_curses_wacs_map['k'] = *WACS_PLUS],
+	 ${cf_cv_curses_wacs_map}['k'] = *WACS_PLUS; (void)foo],
 	[cf_cv_curses_wacs_symbols=yes])
 else
 	AC_TRY_LINK([
@@ -983,7 +1272,7 @@
 #define _XOPEN_SOURCE_EXTENDED
 #endif
 #include <${cf_cv_ncurses_header:-curses.h}>],
-	[cchar_t *foo = WACS_PLUS],
+	[cchar_t *foo = WACS_PLUS; (void)foo],
 	[cf_cv_curses_wacs_symbols=yes])
 fi
 ])
@@ -991,14 +1280,14 @@
 test "$cf_cv_curses_wacs_symbols" != no && AC_DEFINE(CURSES_WACS_SYMBOLS,1,[Define to 1 if (n)curses supports wide-character WACS_ symbols])
 ])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:
@@ -1033,7 +1322,7 @@
 AC_SUBST(ECHO_CC)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_DISABLE_LEAKS version: 7 updated: 2012/10/02 20:55:03
+dnl CF_DISABLE_LEAKS version: 9 updated: 2021/04/03 16:41:50
 dnl ----------------
 dnl Combine no-leak checks with the libraries or tools that are used for the
 dnl checks.
@@ -1046,17 +1335,19 @@
 AC_MSG_CHECKING(if you want to perform memory-leak testing)
 AC_ARG_ENABLE(leaks,
 	[  --disable-leaks         test: free permanent memory, analyze leaks],
-	[if test "x$enableval" = xno; then with_no_leaks=yes; else with_no_leaks=no; fi],
-	: ${with_no_leaks:=no})
+	[enable_leaks=$enableval],
+	[enable_leaks=yes])
+dnl with_no_leaks is more readable...
+if test "x$enable_leaks" = xno; then with_no_leaks=yes; else with_no_leaks=no; fi
 AC_MSG_RESULT($with_no_leaks)
 
-if test "$with_no_leaks" = yes ; then
+if test "$enable_leaks" = no ; then
 	AC_DEFINE(NO_LEAKS,1,[Define to 1 if you want to perform memory-leak testing.])
 	AC_DEFINE(YY_NO_LEAKS,1,[Define to 1 if you want to perform memory-leak testing.])
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_DISABLE_RPATH_HACK version: 2 updated: 2011/02/13 13:31:33
+dnl CF_DISABLE_RPATH_HACK version: 3 updated: 2021/01/05 20:14:44
 dnl ---------------------
 dnl The rpath-hack makes it simpler to build programs, particularly with the
 dnl *BSD ports which may have essential libraries in unusual places.  But it
@@ -1067,35 +1358,88 @@
 AC_MSG_CHECKING(if rpath-hack should be disabled)
 CF_ARG_DISABLE(rpath-hack,
 	[  --disable-rpath-hack    don't add rpath options for additional libraries],
-	[cf_disable_rpath_hack=yes],
-	[cf_disable_rpath_hack=no])
+	[enable_rpath_hack=no],
+	[enable_rpath_hack=yes])
+dnl TODO - drop cf_disable_rpath_hack
+if test "x$enable_rpath_hack" = xno; then cf_disable_rpath_hack=yes; else cf_disable_rpath_hack=no; fi
 AC_MSG_RESULT($cf_disable_rpath_hack)
-if test "$cf_disable_rpath_hack" = no ; then
+
+if test "$enable_rpath_hack" = yes ; then
 	CF_RPATH_HACK
 fi
 ])
 dnl ---------------------------------------------------------------------------
-dnl CF_ENABLE_WARNINGS version: 4 updated: 2009/07/26 17:53:03
-dnl ------------------
-dnl Configure-option to enable gcc warnings
-AC_DEFUN([CF_ENABLE_WARNINGS],[
-if ( test "$GCC" = yes || test "$GXX" = yes )
-then
-AC_MSG_CHECKING(if you want to turn on gcc warnings)
-CF_ARG_ENABLE(warnings,
-	[  --enable-warnings       test: turn on gcc compiler warnings],
-	[with_warnings=yes],
-	[with_warnings=no])
-AC_MSG_RESULT($with_warnings)
-if test "$with_warnings" = "yes"
-then
-	CF_GCC_ATTRIBUTES
-	CF_GCC_WARNINGS
-fi
+dnl CF_ENABLE_STRING_HACKS version: 6 updated: 2021/01/05 19:23:48
+dnl ----------------------
+dnl On a few platforms, the compiler and/or loader nags with untruthful
+dnl comments stating that "most" uses of strcat/strcpy/sprintf are incorrect,
+dnl and implying that most uses of the recommended alternatives are correct.
+dnl
+dnl Factually speaking, no one has actually counted the number of uses of these
+dnl functions versus the total of incorrect uses.  Samples of a few thousand
+dnl instances are meaningless compared to the hundreds of millions of lines of
+dnl existing C code.
+dnl
+dnl strlcat/strlcpy are (as of 2012) non-standard, and are available on some
+dnl platforms, in implementations of varying quality.  Likewise, snprintf is
+dnl standard - but evolved through phases, and older implementations are likely
+dnl to yield surprising results, as documented in manpages on various systems.
+AC_DEFUN([CF_ENABLE_STRING_HACKS],
+[
+AC_MSG_CHECKING(if you want to work around bogus compiler/loader warnings)
+AC_ARG_ENABLE(string-hacks,
+	[  --enable-string-hacks   work around bogus compiler/loader warnings],
+	[enable_string_hacks=$enableval],
+	[enable_string_hacks=no])
+AC_MSG_RESULT($enable_string_hacks)
+
+if test "x$enable_string_hacks" = "xyes"; then
+ 	AC_DEFINE(USE_STRING_HACKS,1,[Define to 1 to work around bogus compiler/loader warnings])
+	AC_MSG_WARN(enabling string-hacks to work around bogus compiler/loader warnings)
+	AC_CHECK_FUNC(strlcat,[
+		AC_DEFINE(HAVE_STRLCAT,1,[Define to 1 if we have strlcat function])
+		],[
+		AC_CHECK_LIB(bsd,strlcat,[
+			CF_ADD_LIB(bsd)
+			AC_CHECK_HEADERS(bsd/string.h)
+			AC_DEFINE(HAVE_STRLCAT,1,[Define to 1 if we have strlcat function])
+			])
+		])
+	AC_CHECK_FUNCS( strlcpy snprintf )
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_FIND_LIBRARY version: 9 updated: 2008/03/23 14:48:54
+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
@@ -1111,16 +1455,16 @@
 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,$2)
@@ -1130,22 +1474,22 @@
 				LIBS="-L$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.
@@ -1202,9 +1546,10 @@
 	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
@@ -1236,7 +1581,7 @@
 			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"
@@ -1275,7 +1620,47 @@
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_FUNC_CURSES_VERSION version: 6 updated: 2012/10/06 16:39:58
+dnl CF_FIX_WARNINGS version: 4 updated: 2021/12/16 18:22:31
+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 "$GXX" = yes
+then
+	case [$]$1 in
+	(*-Werror=*)
+		cf_temp_flags=
+		for cf_temp_scan in [$]$1
+		do
+			case "x$cf_temp_scan" in
+			(x-Werror=format*)
+				CF_APPEND_TEXT(cf_temp_flags,$cf_temp_scan)
+				;;
+			(x-Werror=*)
+				CF_APPEND_TEXT(EXTRA_CFLAGS,$cf_temp_scan)
+				;;
+			(*)
+				CF_APPEND_TEXT(cf_temp_flags,$cf_temp_scan)
+				;;
+			esac
+		done
+		if test "x[$]$1" != "x$cf_temp_flags"
+		then
+			CF_VERBOSE(repairing $1: [$]$1)
+			$1="$cf_temp_flags"
+			CF_VERBOSE(... fixed [$]$1)
+			CF_VERBOSE(... extra $EXTRA_CFLAGS)
+		fi
+		;;
+	esac
+fi
+AC_SUBST(EXTRA_CFLAGS)
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_FUNC_CURSES_VERSION version: 9 updated: 2023/01/05 18:06:10
 dnl ----------------------
 dnl Solaris has a data item 'curses_version', which confuses AC_CHECK_FUNCS.
 dnl It's a character string "SVR4", not documented.
@@ -1283,11 +1668,14 @@
 [
 AC_CACHE_CHECK(for function curses_version, cf_cv_func_curses_version,[
 AC_TRY_RUN([
+$ac_includes_default
+
 #include <${cf_cv_ncurses_header:-curses.h}>
-int main()
+
+int main(void)
 {
 	char temp[1024];
-	sprintf(temp, "%s\n", curses_version());
+	sprintf(temp, "%.999s\\n", curses_version());
 	${cf_cv_main_return:-return}(0);
 }]
 ,[cf_cv_func_curses_version=yes]
@@ -1297,14 +1685,72 @@
 test "$cf_cv_func_curses_version" = yes && AC_DEFINE(HAVE_CURSES_VERSION,1,[Define to 1 if we have curses_version function])
 ])
 dnl ---------------------------------------------------------------------------
-dnl CF_GCC_ATTRIBUTES version: 17 updated: 2015/04/12 15:39:00
+dnl CF_FUNC_GETTIME version: 2 updated: 2023/02/25 08:45:56
+dnl ---------------
+dnl Check for gettimeofday or clock_gettime.  In 2023, the former is still more
+dnl widely supported, but "deprecated" (2008), so we will use the latter if it
+dnl is available, to reduce compiler warnings.
+AC_DEFUN([CF_FUNC_GETTIME],[
+AC_CACHE_CHECK(for clock_gettime,cf_cv_func_clock_gettime,[
+		AC_TRY_LINK([#include <time.h>],
+		[struct timespec ts;
+		int rc = clock_gettime(CLOCK_REALTIME, &ts); (void) rc; (void)ts],
+		[cf_cv_func_clock_gettime=yes],
+		[cf_cv_func_clock_gettime=no])
+])
+
+if test "$cf_cv_func_clock_gettime" = yes
+then
+	AC_DEFINE(HAVE_CLOCK_GETTIME,1,[Define to 1 if we have clock_gettime function])
+else
+AC_CHECK_FUNC(gettimeofday,
+	AC_DEFINE(HAVE_GETTIMEOFDAY,1,[Define to 1 if we have gettimeofday function]),[
+
+AC_CHECK_LIB(bsd, gettimeofday,
+	AC_DEFINE(HAVE_GETTIMEOFDAY,1,[Define to 1 if we have gettimeofday function])
+	CF_ADD_LIB(bsd))])dnl CLIX: bzero, select, gettimeofday
+fi
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_FUNC_OPENPTY version: 7 updated: 2023/12/03 09:21:34
+dnl ---------------
+dnl Check for openpty() function, along with <pty.h> header.  It may need the
+dnl "util" library as well.
+AC_DEFUN([CF_FUNC_OPENPTY],
+[
+AC_CHECK_LIB(util,openpty,cf_cv_lib_util=yes,cf_cv_lib_util=no)
+AC_CACHE_CHECK(for openpty header,cf_cv_func_openpty,[
+	cf_save_LIBS="$LIBS"
+	test "$cf_cv_lib_util" = yes && { CF_ADD_LIB(util) }
+	for cf_header in pty.h libutil.h util.h
+	do
+	AC_TRY_LINK([
+#include <$cf_header>
+],[
+	int x = openpty((int *)0, (int *)0, (char *)0,
+				   (struct termios *)0, (struct winsize *)0);
+	(void)x;
+],[
+		cf_cv_func_openpty=$cf_header
+		break
+],[
+		cf_cv_func_openpty=no
+])
+	done
+	LIBS="$cf_save_LIBS"
+])
+])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 "$GXX" = yes
 then
 cat > conftest.i <<EOF
 #ifndef GCC_PRINTF
@@ -1323,8 +1769,9 @@
 if test "$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 <stdio.h>
 #include "confdefs.h"
 #include "conftest.h"
 #include "conftest.i"
@@ -1339,9 +1786,9 @@
 #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
@@ -1351,7 +1798,7 @@
 		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
@@ -1374,7 +1821,7 @@
 		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])
 				;;
@@ -1401,32 +1848,36 @@
 		fi
 	done
 else
-	fgrep define conftest.i >>confdefs.h
+	${FGREP-fgrep} define conftest.i >>confdefs.h
 fi
-rm -rf conftest*
+rm -rf ./conftest*
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_GCC_VERSION version: 7 updated: 2012/10/18 06:46:33
+dnl CF_GCC_VERSION version: 9 updated: 2023/03/05 14:30:13
 dnl --------------
-dnl Find version of gcc
+dnl Find version of gcc, and (because icc/clang pretend to be gcc without being
+dnl compatible), attempt to determine if icc/clang is actually used.
 AC_DEFUN([CF_GCC_VERSION],[
 AC_REQUIRE([AC_PROG_CC])
 GCC_VERSION=none
 if test "$GCC" = yes ; then
 	AC_MSG_CHECKING(version of $CC)
-	GCC_VERSION="`${CC} --version 2>/dev/null | sed -e '2,$d' -e 's/^.*(GCC[[^)]]*) //' -e 's/^.*(Debian[[^)]]*) //' -e 's/^[[^0-9.]]*//' -e 's/[[^0-9.]].*//'`"
+	GCC_VERSION="`${CC} --version 2>/dev/null | sed -e '2,$d' -e 's/^[[^(]]*([[^)]][[^)]]*) //' -e 's/^[[^0-9.]]*//' -e 's/[[^0-9.]].*//'`"
 	test -z "$GCC_VERSION" && GCC_VERSION=unknown
 	AC_MSG_RESULT($GCC_VERSION)
 fi
+CF_INTEL_COMPILER(GCC,INTEL_COMPILER,CFLAGS)
+CF_CLANG_COMPILER(GCC,CLANG_COMPILER,CFLAGS)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_GCC_WARNINGS version: 32 updated: 2015/04/12 15:39:00
+dnl CF_GCC_WARNINGS version: 41 updated: 2021/01/01 16:53:59
 dnl ---------------
 dnl Check if the compiler supports useful warning options.  There's a few that
 dnl we don't use, simply because they're too noisy:
 dnl
 dnl	-Wconversion (useful in older versions of gcc, but not in gcc 2.7.x)
+dnl	-Winline (usually not worthwhile)
 dnl	-Wredundant-decls (system headers make this too noisy)
 dnl	-Wtraditional (combines too many unrelated messages, only a few useful)
 dnl	-Wwrite-strings (too noisy, but should review occasionally).  This
@@ -1443,14 +1894,11 @@
 AC_DEFUN([CF_GCC_WARNINGS],
 [
 AC_REQUIRE([CF_GCC_VERSION])
-CF_INTEL_COMPILER(GCC,INTEL_COMPILER,CFLAGS)
-CF_CLANG_COMPILER(GCC,CLANG_COMPILER,CFLAGS)
-
-cat > conftest.$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:
@@ -1466,7 +1914,7 @@
 
 	AC_CHECKING([for $CC warning options])
 	cf_save_CFLAGS="$CFLAGS"
-	EXTRA_CFLAGS="-Wall"
+	EXTRA_CFLAGS="$EXTRA_CFLAGS -Wall"
 	for cf_opt in \
 		wd1419 \
 		wd1683 \
@@ -1485,12 +1933,10 @@
 		fi
 	done
 	CFLAGS="$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"
@@ -1508,24 +1954,21 @@
 		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 $GCC_VERSION)
 					continue;;
@@ -1537,12 +1980,12 @@
 	done
 	CFLAGS="$cf_save_CFLAGS"
 fi
-rm -rf conftest*
+rm -rf ./conftest*
 
 AC_SUBST(EXTRA_CFLAGS)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_GETOPT_HEADER version: 6 updated: 2014/07/22 14:45:54
+dnl CF_GETOPT_HEADER version: 8 updated: 2021/06/19 19:16:16
 dnl ----------------
 dnl Check for getopt's variables which are commonly defined in stdlib.h,
 dnl unistd.h or (nonstandard) in getopt.h
@@ -1555,20 +1998,20 @@
 do
 AC_TRY_COMPILE([
 #include <$cf_header>],
-[int x = optind; char *y = optarg],
+[int x = optind; char *y = optarg; (void)x; (void)y],
 [cf_cv_getopt_header=$cf_header
  break])
 done
 ])
-if test $cf_cv_getopt_header != none ; then
+if test "$cf_cv_getopt_header" != none ; then
 	AC_DEFINE(HAVE_GETOPT_HEADER,1,[Define to 1 if getopt variables are declared in header])
 fi
-if test $cf_cv_getopt_header = getopt.h ; then
+if test "$cf_cv_getopt_header" = getopt.h ; then
 	AC_DEFINE(NEED_GETOPT_H,1,[Define to 1 if we must include getopt.h])
 fi
 ])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
@@ -1576,29 +2019,110 @@
 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
@@ -1614,7 +2138,7 @@
 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)
@@ -1630,25 +2154,26 @@
 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_INHERIT_SCRIPT version: 2 updated: 2003/03/01 23:50:42
@@ -1659,7 +2184,168 @@
 test -f $1 || ( test -f ../$1 && cp ../$1 ./ )
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_INTEL_COMPILER version: 7 updated: 2015/04/12 15:39:00
+dnl CF_INSTALL_OPTS version: 3 updated: 2023/06/03 15:17:30
+dnl ---------------
+dnl prompt for/fill-in useful install-program options
+AC_DEFUN([CF_INSTALL_OPTS],
+[
+CF_INSTALL_OPT_S
+CF_INSTALL_OPT_P
+CF_INSTALL_OPT_O
+CF_INSTALL_OPT_STRIP_PROG
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_INSTALL_OPT_O version: 3 updated: 2020/12/31 20:19:42
+dnl ----------------
+dnl Almost all "install" programs default to the current user's ownership.
+dnl Almost - MINIX is an exception.
+AC_DEFUN([CF_INSTALL_OPT_O],
+[
+AC_MSG_CHECKING(if install needs to be told about ownership)
+case `$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 "$enable_stripping" = yes
+then
+	INSTALL_OPT_S="-s"
+else
+	INSTALL_OPT_S=
+fi
+AC_SUBST(INSTALL_OPT_S)
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_INSTALL_OPT_STRIP_PROG version: 1 updated: 2023/06/03 15:17:30
+dnl -------------------------
+dnl Provide an option for overriding the strip program used in install "-s"
+dnl
+dnl coreutils install provides a --strip-program option
+dnl FreeBSD uses STRIPBIN environment variable, while NetBSD and OpenBSD use
+dnl STRIP environment variable.  Other versions of install do not support this.
+AC_DEFUN([CF_INSTALL_OPT_STRIP_PROG],
+[
+AC_REQUIRE([CF_INSTALL_OPT_S])
+if test -n "$INSTALL_OPT_S"
+then
+	AC_MSG_CHECKING(if you want to specify strip-program)
+	AC_ARG_WITH(strip-program,
+		[  --with-strip-program=XX specify program to use when stripping in install],
+		[with_strip_program=$withval],
+		[with_strip_program=no])
+	AC_MSG_RESULT($with_strip_program)
+	if test "$with_strip_program" != no
+	then
+		AC_MSG_CHECKING(if strip-program is supported with this installer)
+		cf_install_program=`echo "$INSTALL" | sed -e 's%[[ ]]*[[ ]]-.%%'`
+		check_install_strip=no
+		if test -f "$cf_install_program"
+		then
+			check_install_version=`"$cf_install_program" --version 2>/dev/null | head -n 1 | grep coreutils`
+			if test -n "$check_install_version"
+			then
+				check_install_strip="option"
+			else
+				for check_strip_variable in STRIPBIN STRIP
+				do
+					if strings "$cf_install_program" | grep "^$check_strip_variable[$]" >/dev/null
+					then
+						check_install_strip="environ"
+						break
+					fi
+				done
+			fi
+		fi
+		AC_MSG_RESULT($check_install_strip)
+		case "$check_install_strip" in
+		(no)
+			AC_MSG_WARN($cf_install_program does not support strip program option)
+			with_strip_program=no
+			;;
+		(environ)
+			cat >install.tmp <<-CF_EOF
+			#! $SHELL
+			STRIPBIN="$with_strip_program" \\
+			STRIP="$with_strip_program" \\
+			$INSTALL "[$]@"
+			CF_EOF
+			INSTALL="`pwd`/install.tmp"
+			chmod +x "$INSTALL"
+			CF_VERBOSE(created $INSTALL)
+			;;
+		(option)
+			INSTALL_OPT_S="$INSTALL_OPT_S --strip-program=\"$with_strip_program\""
+			;;
+		esac
+	fi
+fi
+AC_SUBST(INSTALL_OPT_S)
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_INTEL_COMPILER version: 9 updated: 2023/02/18 17:41:25
 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
@@ -1677,7 +2363,7 @@
 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])"
@@ -1685,7 +2371,7 @@
 		AC_TRY_COMPILE([],[
 #ifdef __INTEL_COMPILER
 #else
-make an error
+#error __INTEL_COMPILER is not defined
 #endif
 ],[ifelse([$2],,INTEL_COMPILER,[$2])=yes
 cf_save_CFLAGS="$cf_save_CFLAGS -we147"
@@ -1697,7 +2383,7 @@
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_LD_RPATH_OPT version: 6 updated: 2015/04/12 15:39:00
+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.
@@ -1706,52 +2392,55 @@
 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 "$GCC" = yes; then
+			LD_RPATH_OPT="-Wl,-rpath,"
+		else
+			LD_RPATH_OPT="-rpath "
+		fi
+		;;
+	(linux*|gnu*|k*bsd*-gnu|freebsd*)
 		LD_RPATH_OPT="-Wl,-rpath,"
-	else
+		;;
+	(openbsd[[2-9]].*|mirbsd*)
+		LD_RPATH_OPT="-Wl,-rpath,"
+		;;
+	(dragonfly*)
 		LD_RPATH_OPT="-rpath "
-	fi
-	;;
-(linux*|gnu*|k*bsd*-gnu)
-	LD_RPATH_OPT="-Wl,-rpath,"
-	;;
-(openbsd[[2-9]].*|mirbsd*)
-	LD_RPATH_OPT="-Wl,-rpath,"
-	;;
-(dragonfly*|freebsd*)
-	LD_RPATH_OPT="-rpath "
-	;;
-(netbsd*)
-	LD_RPATH_OPT="-Wl,-rpath,"
-	;;
-(osf*|mls+*)
-	LD_RPATH_OPT="-rpath "
-	;;
-(solaris2*)
-	LD_RPATH_OPT="-R"
-	;;
-(*)
-	;;
-esac
-AC_MSG_RESULT($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
@@ -1765,7 +2454,7 @@
 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)
@@ -1780,6 +2469,89 @@
 $1="$cf_library_path_list [$]$1"
 ])dnl
 dnl ---------------------------------------------------------------------------
+dnl CF_MAKE_PHONY version: 3 updated: 2021/01/08 16:08:21
+dnl -------------
+dnl Check if the make-program handles a ".PHONY" target, e.g,. a target which
+dnl acts as a placeholder.
+dnl
+dnl The ".PHONY" feature was proposed in 2011 here
+dnl     https://www.austingroupbugs.net/view.php?id=523
+dnl and is scheduled for release in P1003.1 Issue 8 (late 2022).
+dnl
+dnl This is not supported by SVr4 make (or SunOS 4, 4.3SD, etc), but works with
+dnl a few others (i.e., GNU make and the non-POSIX "BSD" make):
+dnl
+dnl + This is a GNU make feature (since April 1988, but in turn from binutils,
+dnl   date unspecified).
+dnl
+dnl + It was adopted in NetBSD make in June 1995.
+dnl
+dnl + The other BSD make programs are derived from the NetBSD make (and for
+dnl   that reason are not actually different "implementations").
+dnl
+dnl + Some features of NetBSD make were actually adapted from pmake, which
+dnl   began as a modified GNU make starting in 1993.
+dnl
+dnl + Version 3.8 of the dmake program in January 1992 also implemented this
+dnl   GNU make extension, but is less well known than the BSD make.
+AC_DEFUN([CF_MAKE_PHONY],[
+AC_CACHE_CHECK(for \".PHONY\" make-support, cf_cv_make_PHONY,[
+	rm -rf conftest*
+	(
+		mkdir conftest || exit 1
+		cd conftest
+		cat >makefile <<'CF_EOF'
+.PHONY: always
+DATA=0
+always:	always.out
+	@echo "** making [$]@ [$](DATA)"
+once: once.out
+	@echo "** making [$]@ [$](DATA)"
+always.out:
+	@echo "** making [$]@ [$](DATA)"
+	echo [$](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
@@ -1817,7 +2589,7 @@
 AC_SUBST(MAKE_LOWER_TAGS)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_MATH_LIB version: 8 updated: 2010/05/29 16:31:02
+dnl CF_MATH_LIB version: 11 updated: 2022/07/27 19:01:48
 dnl -----------
 dnl Checks for libraries.  At least one UNIX system, Apple Macintosh
 dnl Rhapsody 5.5, does not have -lm.  We cannot use the simpler
@@ -1827,21 +2599,46 @@
 AC_CACHE_CHECK(if -lm needed for math functions,
 	cf_cv_need_libm,[
 	AC_TRY_LINK([
-	#include <stdio.h>
-	#include <math.h>
+		#include <stdio.h>
+		#include <stdlib.h>
+		#include <math.h>
 	],
-	[double x = rand(); printf("result = %g\n", ]ifelse([$2],,sin(x),$2)[)],
+	[double x = rand(); printf("result = %g\\n", ]ifelse([$2],,sin(x),$2)[)],
 	[cf_cv_need_libm=no],
 	[cf_cv_need_libm=yes])])
+
 if test "$cf_cv_need_libm" = yes
 then
-ifelse($1,,[
-	CF_ADD_LIB(m)
-],[$1=-lm])
+
+	cf_save_LIBS="$LIBS"
+	LIBS="$LIBS -lm"
+	AC_CACHE_CHECK(if -lm is available for math functions,
+	cf_cv_have_libm,[
+	AC_TRY_LINK([
+		#include <stdio.h>
+		#include <stdlib.h>
+		#include <math.h>
+	],
+	[double x = rand(); printf("result = %g\\n", ]ifelse([$2],,sin(x),$2)[)],
+	[cf_cv_have_libm=yes],
+	[cf_cv_have_libm=no])])
+	LIBS="$cf_save_LIBS"
+
+	if test "$cf_cv_have_libm" = yes
+	then
+		ifelse($1,,[CF_ADD_LIB(m)],[$1=-lm])
+	fi
+else
+	cf_cv_have_libm=yes
+fi
+
+if test "$cf_cv_have_libm" = yes
+then
+	AC_DEFINE(HAVE_MATH_FUNCS,1,[Define to 1 if math functions are available])
 fi
 ])
 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.
@@ -1849,8 +2646,8 @@
 [
 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
 		;;
 	(*)
@@ -1879,7 +2676,7 @@
 echo "${as_me:-configure}:__oline__: testing $* ..." 1>&AC_FD_CC
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_NCURSES_CC_CHECK version: 4 updated: 2007/07/29 10:39:05
+dnl CF_NCURSES_CC_CHECK version: 6 updated: 2023/02/18 17:47:58
 dnl -------------------
 dnl Check if we can compile with ncurses' header file
 dnl $1 is the cache variable to set
@@ -1896,15 +2693,15 @@
 #ifdef NCURSES_VERSION
 ]ifelse($3,ncursesw,[
 #ifndef WACS_BSSB
-	make an error
+	#error WACS_BSSB is not defined
 #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
+	#error __NCURSES_H is not defined
 #endif
 #endif
 	]
@@ -1912,7 +2709,7 @@
 	,[$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:
@@ -1934,17 +2731,53 @@
 		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])],
@@ -1959,6 +2792,7 @@
 		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
@@ -1970,15 +2804,15 @@
 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
@@ -1992,7 +2826,7 @@
 		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
 
@@ -2005,7 +2839,7 @@
 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.
@@ -2039,7 +2873,7 @@
 
 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,$1)
@@ -2091,7 +2925,7 @@
 test "$cf_cv_ncurses_ext_funcs" = yes && AC_DEFINE(NCURSES_EXT_FUNCS,1,[Define to 1 if we have ncurses extensions])
 ])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.
@@ -2106,7 +2940,7 @@
 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 $cf_search
 	do
@@ -2118,7 +2952,7 @@
 			CF_NCURSES_CC_CHECK(cf_cv_ncurses_h2,$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
@@ -2130,9 +2964,9 @@
 	])
 
 	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)
 
@@ -2140,13 +2974,13 @@
 
 # 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])
 	;;
@@ -2157,7 +2991,7 @@
 
 ])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.
@@ -2183,10 +3017,10 @@
 		[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
@@ -2195,7 +3029,7 @@
 
 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
@@ -2209,13 +3043,13 @@
 	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="$cf_ncurses_SAVE"])
@@ -2225,7 +3059,22 @@
 AC_DEFINE_UNQUOTED($cf_nculib_ROOT)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_NCURSES_VERSION version: 14 updated: 2012/10/06 08:57:51
+dnl CF_NCURSES_PTHREADS version: 2 updated: 2016/04/22 05:07:41
+dnl -------------------
+dnl Use this followup check to ensure that we link with pthreads if ncurses
+dnl uses it.
+AC_DEFUN([CF_NCURSES_PTHREADS],[
+: ${cf_nculib_root:=ifelse($1,,ncurses,$1)}
+AC_CHECK_LIB($cf_nculib_root,_nc_init_pthreads,
+	cf_cv_ncurses_pthreads=yes,
+	cf_cv_ncurses_pthreads=no)
+if test "$cf_cv_ncurses_pthreads" = yes
+then
+	CF_ADD_LIBS(-lpthread)
+fi
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_NCURSES_VERSION version: 18 updated: 2024/01/07 06:34:16
 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
@@ -2236,24 +3085,26 @@
 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([
+$ac_includes_default
+
 #include <${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
+	#error expected ncurses header to define __NCURSES_H
 # endif
 #endif
 	${cf_cv_main_return:-return}(0);
@@ -2262,7 +3113,7 @@
 
 	# 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 <${cf_cv_ncurses_header:-curses.h}>
 #undef Autoconf
 #ifdef NCURSES_VERSION
@@ -2277,12 +3128,12 @@
 	cf_try="$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 "$cf_cv_ncurses_version" = no || AC_DEFINE(NCURSES,1,[Define to 1 if we are using ncurses headers/libraries])
 ])dnl
@@ -2342,23 +3193,33 @@
 test "$cf_cv_netbsd_menu_h" = yes && AC_DEFINE(HAVE_NETBSD_MENU_H,1,[Define to 1 if we appear to be using NetBSD menu.h])
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_NO_LEAKS_OPTION version: 6 updated: 2015/04/12 15:39:00
+dnl CF_NO_LEAKS_OPTION version: 9 updated: 2021/06/13 19:45:41
 dnl ------------------
 dnl see CF_WITH_NO_LEAKS
+dnl
+dnl $1 = option/name
+dnl $2 = help-text
+dnl $3 = symbol to define if the option is set
+dnl $4 = additional actions to take if the option is set
 AC_DEFUN([CF_NO_LEAKS_OPTION],[
 AC_MSG_CHECKING(if you want to use $1 for testing)
 AC_ARG_WITH($1,
 	[$2],
-	[AC_DEFINE_UNQUOTED($3,1,"Define to 1 if you want to use $1 for testing.")ifelse([$4],,[
+	[case "x$withval" in
+	(x|xno) ;;
+	(*)
+		: "${with_cflags:=-g}"
+		: "${enable_leaks:=no}"
+		with_$1=yes
+		AC_DEFINE_UNQUOTED($3,1,"Define to 1 if you want to use $1 for testing.")ifelse([$4],,[
 	 $4
 ])
-	: ${with_cflags:=-g}
-	: ${with_no_leaks:=yes}
-	 with_$1=yes],
+		;;
+	esac],
 	[with_$1=])
 AC_MSG_RESULT(${with_$1:-no})
 
-case .$with_cflags in
+case ".$with_cflags" in
 (.*-g*)
 	case .$CFLAGS in
 	(.*-g*)
@@ -2371,7 +3232,7 @@
 esac
 ])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
@@ -2391,16 +3252,16 @@
 	;;
 (.[[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)
@@ -2408,7 +3269,7 @@
 esac
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_PDCURSES_X11 version: 13 updated: 2012/10/06 16:39:58
+dnl CF_PDCURSES_X11 version: 15 updated: 2021/01/02 09:31:20
 dnl ---------------
 dnl Configure for PDCurses' X11 library
 AC_DEFUN([CF_PDCURSES_X11],[
@@ -2420,7 +3281,7 @@
 
 if test "$XCURSES_CONFIG" != none ; then
 
-CPPFLAGS="$CPPFLAGS `$XCURSES_CONFIG --cflags`"
+CF_ADD_CFLAGS(`$XCURSES_CONFIG --cflags`)
 CF_ADD_LIBS(`$XCURSES_CONFIG --libs`)
 
 cf_cv_lib_XCurses=yes
@@ -2444,7 +3305,7 @@
 
 fi
 
-if test $cf_cv_lib_XCurses = yes ; then
+if test "$cf_cv_lib_XCurses" = yes ; then
 	AC_DEFINE(UNIX,1,[Define to 1 if using PDCurses on Unix])
 	AC_DEFINE(XCURSES,1,[Define to 1 if using PDCurses on Unix])
 	AC_CHECK_HEADER(xcurses.h, AC_DEFINE(HAVE_XCURSES,1,[Define to 1 if using PDCurses on Unix]))
@@ -2453,19 +3314,21 @@
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_PKG_CONFIG version: 10 updated: 2015/04/26 18:06:58
+dnl CF_PKG_CONFIG version: 13 updated: 2023/10/28 11:59:01
 dnl -------------
 dnl Check for the package-config program, unless disabled by command-line.
+dnl
+dnl Sets $PKG_CONFIG to the pathname of the pkg-config program.
 AC_DEFUN([CF_PKG_CONFIG],
 [
 AC_MSG_CHECKING(if you want to use pkg-config)
 AC_ARG_WITH(pkg-config,
-	[  --with-pkg-config{=path} enable/disable use of pkg-config],
+	[[  --with-pkg-config[=CMD] enable/disable use of pkg-config and its name CMD]],
 	[cf_pkg_config=$withval],
 	[cf_pkg_config=yes])
 AC_MSG_RESULT($cf_pkg_config)
 
-case $cf_pkg_config in
+case "$cf_pkg_config" in
 (no)
 	PKG_CONFIG=none
 	;;
@@ -2489,7 +3352,7 @@
 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: 12 updated: 2023/02/18 17:41:25
 dnl -----------------
 dnl Define _POSIX_C_SOURCE to the given level, and _POSIX_SOURCE if needed.
 dnl
@@ -2504,7 +3367,10 @@
 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="$CFLAGS"
@@ -2517,7 +3383,7 @@
 	CF_MSG_LOG(if the symbol is already defined go no further)
 	AC_TRY_COMPILE([#include <sys/types.h>],[
 #ifndef _POSIX_C_SOURCE
-make an error
+#error _POSIX_C_SOURCE is not defined
 #endif],
 	[cf_cv_posix_c_source=no],
 	[cf_want_posix_source=no
@@ -2536,17 +3402,18 @@
 	 if test "$cf_want_posix_source" = yes ; then
 		AC_TRY_COMPILE([#include <sys/types.h>],[
 #ifdef _POSIX_SOURCE
-make an error
+#error _POSIX_SOURCE is defined
 #endif],[],
 		cf_cv_posix_c_source="$cf_cv_posix_c_source -D_POSIX_SOURCE")
 	 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,$cf_cv_posix_c_source)
 	 CF_MSG_LOG(if the second compile does not leave our definition intact error)
 	 AC_TRY_COMPILE([#include <sys/types.h>],[
 #ifndef _POSIX_C_SOURCE
-make an error
+#error _POSIX_C_SOURCE is not defined
 #endif],,
 	 [cf_cv_posix_c_source=no])
 	 CFLAGS="$cf_save_CFLAGS"
@@ -2560,9 +3427,38 @@
 	CF_ADD_CFLAGS($cf_cv_posix_c_source)
 fi
 
+fi # cf_cv_posix_visible
+
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_PRG_RULES version: 1 updated: 2006/06/03 11:45:08
+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_PRG_RULES version: 2 updated: 2021/01/01 13:31:04
 dnl ------------
 dnl Append definitions and rules for the given programs to the subdirectory
 dnl Makefiles, and the recursion rule for the top-level Makefile.
@@ -2577,20 +3473,24 @@
 [
 for cf_dir in $2
 do
-	if test ! -d $srcdir/$cf_dir; then
+	if test ! -d "$srcdir/$cf_dir" ; then
 		continue
-	elif test -f $srcdir/$cf_dir/programs; then
-		$AWK -f $1 $srcdir/$cf_dir/programs >>$cf_dir/Makefile
+	elif test -f "$srcdir/$cf_dir/programs" ; then
+		$AWK -f $1 "$srcdir/$cf_dir/programs" >>$cf_dir/Makefile
 	fi
 done
 
 ])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,
@@ -2599,7 +3499,7 @@
 CF_CC_ENV_FLAGS
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_PROG_INSTALL version: 7 updated: 2015/04/18 08:56:57
+dnl CF_PROG_INSTALL version: 10 updated: 2021/01/04 19:33:05
 dnl ---------------
 dnl Force $INSTALL to be an absolute-path.  Otherwise, edit_man.sh and the
 dnl misc/tabset install won't work properly.  Usually this happens only when
@@ -2612,17 +3512,41 @@
 (*)
 	CF_DIRNAME(cf_dir,$INSTALL)
 	test -z "$cf_dir" && cf_dir=.
-	INSTALL=`cd $cf_dir && pwd`/`echo $INSTALL | sed -e 's%^.*/%%'`
+	INSTALL="`cd \"$cf_dir\" && pwd`"/"`echo "$INSTALL" | sed -e 's%^.*/%%'`"
 	;;
 esac
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_PROG_LINT version: 2 updated: 2009/08/12 04:43:14
+dnl CF_PROG_LINT version: 5 updated: 2022/08/20 15:44:13
 dnl ------------
 AC_DEFUN([CF_PROG_LINT],
 [
-AC_CHECK_PROGS(LINT, tdlint lint alint splint lclint)
+AC_CHECK_PROGS(LINT, lint cppcheck splint)
+case "x$LINT" in
+(xcppcheck|x*/cppcheck)
+	test -z "$LINT_OPTS" && LINT_OPTS="--enable=all"
+	;;
+esac
 AC_SUBST(LINT_OPTS)
+AC_SUBST(LINT_LIBS)
+])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
@@ -2642,11 +3566,23 @@
 		-e 's/-[[UD]]'"$3"'\(=[[^ 	]]*\)\?[$]//g'`
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_RPATH_HACK version: 11 updated: 2013/09/01 13:02:00
+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_$1"
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_RPATH_HACK version: 13 updated: 2021/01/03 18:30:50
 dnl -------------
 AC_DEFUN([CF_RPATH_HACK],
-[
-AC_REQUIRE([CF_LD_RPATH_OPT])
+[AC_REQUIRE([AC_PROG_FGREP])dnl
+AC_REQUIRE([CF_LD_RPATH_OPT])dnl
+
 AC_MSG_CHECKING(for updated LDFLAGS)
 if test -n "$LD_RPATH_OPT" ; then
 	AC_MSG_RESULT(maybe)
@@ -2659,8 +3595,8 @@
 
 AC_TRY_LINK([#include <stdio.h>],
 		[printf("Hello");],
-		[cf_rpath_oops=`$cf_ldd_prog conftest$ac_exeext | fgrep ' not found' | sed -e 's% =>.*$%%' |sort | uniq`
-		 cf_rpath_list=`$cf_ldd_prog conftest$ac_exeext | fgrep / | sed -e 's%^.*[[ 	]]/%/%' -e 's%/[[^/]][[^/]]*$%%' |sort | uniq`])
+		[cf_rpath_oops=`"$cf_ldd_prog" "conftest$ac_exeext" | ${FGREP-fgrep} ' not found' | sed -e 's% =>.*$%%' |sort | uniq`
+		 cf_rpath_list=`"$cf_ldd_prog" "conftest$ac_exeext" | ${FGREP-fgrep} / | sed -e 's%^.*[[ 	]]/%/%' -e 's%/[[^/]][[^/]]*$%%' |sort | uniq`])
 
 		# If we passed the link-test, but get a "not found" on a given library,
 		# this could be due to inept reconfiguration of gcc to make it only
@@ -2676,7 +3612,7 @@
 					/usr/pkg \
 					/opt/sfw
 				do
-					if test -f $cf_rpath_dir/lib/$cf_rpath_src
+					if test -f "$cf_rpath_dir/lib/$cf_rpath_src"
 					then
 						CF_VERBOSE(...adding -L$cf_rpath_dir/lib to LDFLAGS for $cf_rpath_src)
 						LDFLAGS="$LDFLAGS -L$cf_rpath_dir/lib"
@@ -2699,7 +3635,7 @@
 AC_SUBST(EXTRA_LDFLAGS)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_RPATH_HACK_2 version: 7 updated: 2015/04/12 15:39:00
+dnl CF_RPATH_HACK_2 version: 8 updated: 2021/01/01 13:31:04
 dnl ---------------
 dnl Do one set of substitutions for CF_RPATH_HACK, adding an rpath option to
 dnl EXTRA_LDFLAGS for each -L option found.
@@ -2715,7 +3651,7 @@
 cf_rpath_dst=
 for cf_rpath_src in [$]$1
 do
-	case $cf_rpath_src in
+	case "$cf_rpath_src" in
 	(-L*)
 
 		# check if this refers to a directory which we will ignore
@@ -2759,9 +3695,93 @@
 AC_SUBST(EXTRA_LDFLAGS)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_SIG_ATOMIC_T version: 3 updated: 2012/10/04 20:12:20
+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 $cf_X_CFLAGS"
+		;;
+	esac
+done
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_SIGWINCH version: 7 updated: 2023/02/18 17:41:25
+dnl -----------
+dnl Use this macro after CF_XOPEN_SOURCE, but do not require it (not all
+dnl programs need this test).
+dnl
+dnl This is really a Mac OS X 10.4.3 workaround.  Defining _POSIX_C_SOURCE
+dnl forces SIGWINCH to be undefined (breaks xterm, ncurses).  Oddly, the struct
+dnl winsize declaration is left alone - we may revisit this if Apple choose to
+dnl break that part of the interface as well.
+AC_DEFUN([CF_SIGWINCH],
+[
+AC_CACHE_CHECK(if SIGWINCH is defined,cf_cv_define_sigwinch,[
+	AC_TRY_COMPILE([
+#include <sys/types.h>
+#include <sys/signal.h>
+],[int x = SIGWINCH; (void)x],
+	[cf_cv_define_sigwinch=yes],
+	[AC_TRY_COMPILE([
+#undef _XOPEN_SOURCE
+#undef _POSIX_SOURCE
+#undef _POSIX_C_SOURCE
+#include <sys/types.h>
+#include <sys/signal.h>
+],[int x = SIGWINCH; (void)x],
+	[cf_cv_define_sigwinch=maybe],
+	[cf_cv_define_sigwinch=no])
+])
+])
+
+if test "$cf_cv_define_sigwinch" = maybe ; then
+AC_CACHE_CHECK(for actual SIGWINCH definition,cf_cv_fixup_sigwinch,[
+cf_cv_fixup_sigwinch=unknown
+cf_sigwinch=32
+while test "$cf_sigwinch" != 1
+do
+	AC_TRY_COMPILE([
+#undef _XOPEN_SOURCE
+#undef _POSIX_SOURCE
+#undef _POSIX_C_SOURCE
+#include <sys/types.h>
+#include <sys/signal.h>
+],[
+#if SIGWINCH != $cf_sigwinch
+#error SIGWINCH is not $cf_sigwinch
+#endif
+int x = SIGWINCH; (void)x],
+	[cf_cv_fixup_sigwinch=$cf_sigwinch
+	 break])
+
+cf_sigwinch="`expr "$cf_sigwinch" - 1`"
+done
+])
+
+	if test "$cf_cv_fixup_sigwinch" != unknown ; then
+		CPPFLAGS="$CPPFLAGS -DSIGWINCH=$cf_cv_fixup_sigwinch"
+	fi
+fi
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_SIG_ATOMIC_T version: 5 updated: 2020/03/10 18:53:47
 dnl ---------------
-dnl signal handler, but there are some gcc depedencies in that recommendation.
+dnl signal handler, but there are some gcc dependencies in that recommendation.
 dnl Try anyway.
 AC_DEFUN([CF_SIG_ATOMIC_T],
 [
@@ -2781,6 +3801,7 @@
 $cf_type x;
 static void handler(int sig)
 {
+	(void)sig;
 	x = 5;
 }],
 		[signal(SIGINT, handler);
@@ -2841,14 +3862,14 @@
 test "$cf_cv_sys_time_select" = yes && AC_DEFINE(HAVE_SYS_TIME_SELECT,1,[Define to 1 if we can include <sys/time.h> with <sys/select.h>])
 ])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%'`
 	;;
@@ -2862,7 +3883,7 @@
 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
 	])
@@ -2872,13 +3893,13 @@
 
 # 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])
 	;;
@@ -2897,21 +3918,21 @@
 AC_SUBST(top_builddir)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_TPUTS_PROTO version: 3 updated: 2015/04/17 21:26:14
+dnl CF_TPUTS_PROTO version: 4 updated: 2021/01/04 19:45:09
 dnl --------------
 dnl Check for type of function-pointer passed to tputs.  Some old
 dnl implementations used functions that had different prototypes, making it
 dnl hard to compile portable programs using tputs.
 AC_DEFUN([CF_TPUTS_PROTO],[
 CF_CURSES_FUNCS(tputs)
-if test x$cf_cv_func_tputs = xyes
+if test "x$cf_cv_func_tputs" = xyes
 then
 	cf_done=no
 	for cf_arg in int char
 	do
 		for cf_ret in int void
 		do
-			if test $cf_ret = void
+			if test "$cf_ret" = void
 			then
 				cf_return="/* nothing */"
 			else
@@ -2936,7 +3957,7 @@
 		break
 ])
 		done
-		test $cf_done = yes && break
+		test "$cf_done" = yes && break
 	done
 fi
 ])dnl
@@ -2957,21 +3978,21 @@
 	done
 ])
 dnl ---------------------------------------------------------------------------
-dnl CF_TRY_PKG_CONFIG version: 5 updated: 2013/07/06 21:27:06
+dnl CF_TRY_PKG_CONFIG version: 6 updated: 2020/12/31 10:54:15
 dnl -----------------
 dnl This is a simple wrapper to use for pkg-config, for libraries which may be
 dnl available in that form.
 dnl
-dnl $1 = package name
+dnl $1 = package name, which may be a shell variable
 dnl $2 = extra logic to use, if any, after updating CFLAGS and LIBS
 dnl $3 = logic to use if pkg-config does not have the package
 AC_DEFUN([CF_TRY_PKG_CONFIG],[
 AC_REQUIRE([CF_PKG_CONFIG])
 
-if test "$PKG_CONFIG" != none && "$PKG_CONFIG" --exists $1; then
+if test "$PKG_CONFIG" != none && "$PKG_CONFIG" --exists "$1"; then
 	CF_VERBOSE(found package $1)
-	cf_pkgconfig_incs="`$PKG_CONFIG --cflags $1 2>/dev/null`"
-	cf_pkgconfig_libs="`$PKG_CONFIG --libs   $1 2>/dev/null`"
+	cf_pkgconfig_incs="`$PKG_CONFIG --cflags "$1" 2>/dev/null`"
+	cf_pkgconfig_libs="`$PKG_CONFIG --libs   "$1" 2>/dev/null`"
 	CF_VERBOSE(package $1 CFLAGS: $cf_pkgconfig_incs)
 	CF_VERBOSE(package $1 LIBS: $cf_pkgconfig_libs)
 	CF_ADD_CFLAGS($cf_pkgconfig_incs)
@@ -2984,34 +4005,20 @@
 fi
 ])
 dnl ---------------------------------------------------------------------------
-dnl CF_TRY_XOPEN_SOURCE version: 1 updated: 2011/10/30 17:09:50
+dnl CF_TRY_XOPEN_SOURCE version: 4 updated: 2022/09/10 15:16:16
 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],
+	AC_TRY_COMPILE(CF__XOPEN_SOURCE_HEAD,CF__XOPEN_SOURCE_BODY,
 	[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="$cf_save"
+	 CF_APPEND_TEXT(CPPFLAGS,-D_XOPEN_SOURCE=$cf_XOPEN_SOURCE)
+	 AC_TRY_COMPILE(CF__XOPEN_SOURCE_HEAD,CF__XOPEN_SOURCE_BODY,
+		[cf_cv_xopen_source=no],
+		[cf_cv_xopen_source=$cf_XOPEN_SOURCE])
+		CPPFLAGS="$cf_save"
 	])
 ])
 
@@ -3019,7 +4026,7 @@
 	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 ---------------------------------------------------------------------------
@@ -3032,15 +4039,20 @@
 $1=`echo "$2" | sed y%abcdefghijklmnopqrstuvwxyz./-%ABCDEFGHIJKLMNOPQRSTUVWXYZ___%`
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_UTF8_LIB version: 8 updated: 2012/10/06 08:57:51
+dnl CF_UTF8_LIB version: 10 updated: 2023/01/11 04:05:23
 dnl -----------
 dnl Check for multibyte support, and if not found, utf8 compatibility library
 AC_DEFUN([CF_UTF8_LIB],
 [
+AC_HAVE_HEADERS(wchar.h)
 AC_CACHE_CHECK(for multibyte character support,cf_cv_utf8_lib,[
 	cf_save_LIBS="$LIBS"
 	AC_TRY_LINK([
-#include <stdlib.h>],[putwc(0,0);],
+$ac_includes_default
+#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,
@@ -3066,7 +4078,7 @@
 CF_MSG_LOG([$1])
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_WCHAR_TYPE version: 4 updated: 2012/10/06 16:39:58
+dnl CF_WCHAR_TYPE version: 5 updated: 2023/12/03 09:21:34
 dnl -------------
 dnl Check if type wide-character type $1 is declared, and if so, which header
 dnl file is needed.  The second parameter is used to set a shell variable when
@@ -3083,7 +4095,7 @@
 #ifdef HAVE_LIBUTF8_H
 #include <libutf8.h>
 #endif],
-	[$1 state],
+	[$1 state; (void)state],
 	[cf_cv_$1=no],
 	[AC_TRY_COMPILE([
 #include <stdlib.h>
@@ -3093,7 +4105,7 @@
 #ifdef HAVE_LIBUTF8_H
 #include <libutf8.h>
 #endif],
-	[$1 value],
+	[$1 value; (void) value],
 	[cf_cv_$1=yes],
 	[cf_cv_$1=unknown])])])
 
@@ -3116,7 +4128,7 @@
 ])
 ])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.
@@ -3129,7 +4141,7 @@
 	[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"
@@ -3170,7 +4182,36 @@
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_WITH_NCURSES_ETC version: 4 updated: 2015/04/25 20:53:11
+dnl CF_WITH_LIB_BASENAME version: 2 updated: 2023/11/22 20:48:30
+dnl --------------------
+dnl Allow for overriding the basename of a library, i.e., the part to which
+dnl prefixes/suffixes are attached.
+dnl
+dnl $1 = variable to set
+dnl $2 = option name
+dnl $3 = default basename for library, if omitted use $2
+AC_DEFUN([CF_WITH_LIB_BASENAME],
+[
+AC_MSG_CHECKING(for desired basename for $2 library)
+AC_ARG_WITH($2-libname,
+	[[  --with-$2-libname[=XXX] override ifelse($3,,$2,$3) basename of library]],
+	[with_lib_basename=$withval],
+	[with_lib_basename=ifelse($3,,$2,$3)])
+$1="$with_lib_basename"
+
+case "x[$]$1" in
+(x|xno|xnone|xyes)
+	$1=ifelse($3,,$2,$3)
+	;;
+(*)
+	;;
+esac
+
+AC_MSG_RESULT([$]$1)
+AC_SUBST($1)
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_WITH_NCURSES_ETC version: 6 updated: 2023/01/16 10:10:06
 dnl -------------------
 dnl Use this macro for programs which use any variant of "curses", e.g.,
 dnl "ncurses", and "PDCurses".  Programs that can use curses and some unrelated
@@ -3229,6 +4270,26 @@
 	;;
 esac
 
+CF_NCURSES_PTHREADS($cf_cv_screen)
+AC_SUBST(cf_cv_screen)
+
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_WITH_SCREEN_PDCURSES version: 1 updated: 2020/08/28 16:56:27
+dnl -----------------------
+dnl Call this macro before CF_ENABLE_WARNINGS for configure scripts which use
+dnl the "--with-screen=pdcurses" selection.  Doing that allows the configure
+dnl script to search for the X11/Xt header files to declare (or not) the
+dnl symbol needed to enable "const" in those header files.  If that configure
+dnl option is not used, then those checks are unnecessary.
+AC_DEFUN([CF_WITH_SCREEN_PDCURSES],[
+AC_PROVIDE([AC_PATH_XTRA])
+AC_PROVIDE([AC_PATH_X])
+if test -n "$with_screen" && test "x$with_screen" = "xpdcurses"
+then
+	AC_PATH_X
+	AC_PATH_XTRA
+fi
 ])dnl
 dnl ---------------------------------------------------------------------------
 dnl CF_WITH_VALGRIND version: 1 updated: 2006/12/14 18:00:21
@@ -3239,7 +4300,93 @@
 	[USE_VALGRIND])
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_XOPEN_CURSES version: 11 updated: 2011/01/18 18:15:30
+dnl CF_WITH_X11_RGB version: 3 updated: 2023/10/28 11:59:01
+dnl ---------------
+dnl Handle configure option "--with-x11-rgb", setting these shell
+dnl variables:
+dnl
+dnl $RGB_PATH is the option value, used for finding the X11 rgb file.
+dnl $no_x11_rgb is a "#" (comment) if "--without-x11-rgb" is given.
+dnl
+dnl Most Linux's use this:
+dnl 	/usr/share/X11/rgb.txt
+dnl Debian uses this:
+dnl 	/etc/X11/rgb.txt
+dnl DragonFlyBSD ports uses this:
+dnl 	/usr/pkg/lib/X11/rgb.txt
+dnl FreeBSD ports use these:
+dnl 	/usr/local/lib/X11/rgb.txt
+dnl 	/usr/local/share/X11/rgb.txt
+dnl Mandriva has these:
+dnl 	/usr/lib/X11/rgb.txt
+dnl 	/usr/lib64/X11/rgb.txt
+dnl NetBSD has these
+dnl 	/usr/X11R7/lib/X11/rgb.txt
+dnl OpenSolaris uses
+dnl 	32-bit:
+dnl 	/usr/X11/etc/X11/rgb.txt
+dnl 	/usr/X11/share/X11/rgb.txt
+dnl 	/usr/X11/lib/X11/rgb.txt
+dnl OSX uses
+dnl		/opt/local/share/X11/rgb.txt (MacPorts)
+dnl		/opt/X11/share/X11/rgb.txt (non-ports)
+dnl	64-bit:
+dnl 	/usr/X11/etc/X11/rgb.txt
+dnl 	/usr/X11/share/X11/rgb.txt (perhaps)
+dnl 	/usr/X11/lib/amd64/X11/rgb.txt
+dnl Solaris10 uses (in this order):
+dnl 	/usr/openwin/lib/X11/rgb.txt
+dnl 	/usr/X11/lib/X11/rgb.txt
+AC_DEFUN([CF_WITH_X11_RGB],[
+AC_MSG_CHECKING(for X11 rgb file)
+AC_ARG_WITH(x11-rgb,
+	[  --with-x11-rgb=FILE     obtain X11 color definitions from FILE (default: EPREFIX/lib/X11/rgb.txt)],
+	[RGB_PATH=$withval],
+	[RGB_PATH=auto])
+
+if test "x[$]RGB_PATH" = xauto
+then
+	RGB_PATH='${exec_prefix}/lib/X11/rgb.txt'
+	for cf_path in \
+		/opt/local/share/X11/rgb.txt \
+		/opt/X11/share/X11/rgb.txt \
+		/usr/share/X11/rgb.txt \
+		/usr/X11/share/X11/rgb.txt \
+		/usr/X11/lib/X11/rgb.txt \
+		/usr/lib/X11/rgb.txt \
+		/etc/X11/rgb.txt \
+		/usr/pkg/lib/X11/rgb.txt \
+		/usr/X11R7/lib/X11/rgb.txt \
+		/usr/X11R6/lib/X11/rgb.txt \
+		/usr/X11R5/lib/X11/rgb.txt \
+		/usr/X11R4/lib/X11/rgb.txt \
+		/usr/local/lib/X11/rgb.txt \
+		/usr/local/share/X11/rgb.txt \
+		/usr/lib64/X11/rgb.txt
+	do
+		if test -f "$cf_path" ; then
+			RGB_PATH="$cf_path"
+			break
+		fi
+	done
+else
+	cf_path=$RGB_PATH
+	CF_PATH_SYNTAX(cf_path)
+fi
+
+AC_MSG_RESULT($RGB_PATH)
+AC_SUBST(RGB_PATH)
+AC_DEFINE_UNQUOTED(RGB_PATH,"$cf_path",[Define to the full pathname of rgb.txt])
+
+no_x11_rgb=
+if test "$RGB_PATH" = no
+then
+	no_x11_rgb="#"
+fi
+AC_SUBST(no_x11_rgb)
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_XOPEN_CURSES version: 20 updated: 2024/01/07 06:54:12
 dnl ---------------
 dnl Test if we should define X/Open source for curses, needed on Digital Unix
 dnl 4.x, to see the extended functions, but breaks on IRIX 6.x.
@@ -3249,36 +4396,63 @@
 AC_DEFUN([CF_XOPEN_CURSES],
 [
 AC_REQUIRE([CF_CURSES_CPPFLAGS])dnl
-AC_CACHE_CHECK(if we must define _XOPEN_SOURCE_EXTENDED,cf_cv_need_xopen_extension,[
+AC_CACHE_CHECK(definition to turn on extended curses functions,cf_cv_need_xopen_extension,[
+cf_cv_need_xopen_extension=unknown
 AC_TRY_LINK([
-#include <stdlib.h>
+$ac_includes_default
 #include <${cf_cv_ncurses_header:-curses.h}>],[
 #if defined(NCURSES_VERSION_PATCH)
 #if (NCURSES_VERSION_PATCH < 20100501) && (NCURSES_VERSION_PATCH >= 20100403)
-	make an error
+	#error disallow ncurses versions between 2020/04/03 and 2010/05/01
 #endif
 #endif
-	long x = winnstr(stdscr, "", 0);
-	int x1, y1;
-	getbegyx(stdscr, y1, x1)],
-	[cf_cv_need_xopen_extension=no],
-	[AC_TRY_LINK([
-#define _XOPEN_SOURCE_EXTENDED
-#include <stdlib.h>
-#include <${cf_cv_ncurses_header:-curses.h}>],[
-#ifdef NCURSES_VERSION
+#ifdef NCURSES_WIDECHAR
+#error prefer to fall-through on the second checks
+#endif
+	static char dummy[10];
 	cchar_t check;
 	int check2 = curs_set((int)sizeof(check));
-#endif
-	long x = winnstr(stdscr, "", 0);
+	long x = winnstr(stdscr, dummy, 5);
 	int x1, y1;
-	getbegyx(stdscr, y1, x1)],
-	[cf_cv_need_xopen_extension=yes],
-	[cf_cv_need_xopen_extension=unknown])])])
-test $cf_cv_need_xopen_extension = yes && CPPFLAGS="$CPPFLAGS -D_XOPEN_SOURCE_EXTENDED"
+	(void)check2;
+	getbegyx(stdscr, y1, x1);
+	(void)x;
+	(void)y1;
+	(void)x1;
+	],
+	[cf_cv_need_xopen_extension=none],
+	[
+	for cf_try_xopen_extension in _XOPEN_SOURCE_EXTENDED NCURSES_WIDECHAR
+	do
+		AC_TRY_LINK([
+#define $cf_try_xopen_extension 1
+$ac_includes_default
+#include <${cf_cv_ncurses_header:-curses.h}>],[
+		static char dummy[10];
+		cchar_t check;
+		int check2 = curs_set((int)sizeof(check));
+		long x = winnstr(stdscr, dummy, 5);
+		int x1, y1;
+		getbegyx(stdscr, y1, x1);
+		(void)check2;
+		(void)x;
+		(void)y1;
+		(void)x1;
+		],
+		[cf_cv_need_xopen_extension=$cf_try_xopen_extension; break])
+	done
+	])
+])
+
+case "$cf_cv_need_xopen_extension" in
+(*_*)
+	CF_APPEND_TEXT(CPPFLAGS,-D$cf_cv_need_xopen_extension)
+	;;
+esac
+
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_XOPEN_SOURCE version: 49 updated: 2015/04/12 15:39:00
+dnl CF_XOPEN_SOURCE version: 67 updated: 2023/09/06 18:55:27
 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,
@@ -3287,20 +4461,32 @@
 dnl Parameters:
 dnl	$1 is the nominal value for _XOPEN_SOURCE
 dnl	$2 is the nominal value for _POSIX_C_SOURCE
+dnl
+dnl The default case prefers _XOPEN_SOURCE over _POSIX_C_SOURCE if the
+dnl implementation predefines it, because X/Open and most implementations agree
+dnl that the latter is a legacy or "aligned" value.
+dnl
+dnl Because _XOPEN_SOURCE is preferred, if defining _POSIX_C_SOURCE turns
+dnl that off, then refrain from setting _POSIX_C_SOURCE explicitly.
+dnl
+dnl References:
+dnl https://pubs.opengroup.org/onlinepubs/007904975/functions/xsh_chap02_02.html
+dnl https://docs.oracle.com/cd/E19253-01/816-5175/standards-5/index.html
+dnl https://www.gnu.org/software/libc/manual/html_node/Feature-Test-Macros.html
 AC_DEFUN([CF_XOPEN_SOURCE],[
 AC_REQUIRE([AC_CANONICAL_HOST])
+AC_REQUIRE([CF_POSIX_VISIBLE])
+
+if test "$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)
-	cf_XOPEN_SOURCE=600
-	;;
 (darwin[[0-8]].*)
 	cf_xopen_source="-D_APPLE_C_SOURCE"
 	;;
@@ -3308,7 +4494,7 @@
 	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
@@ -3326,8 +4512,8 @@
 	cf_xopen_source="-D_SGI_SOURCE"
 	cf_XOPEN_SOURCE=
 	;;
-(linux*|gnu*|mint*|k*bsd*-gnu)
-	CF_GNU_SOURCE
+(linux*gnu|linux*gnuabi64|linux*gnuabin32|linux*gnueabi|linux*gnueabihf|linux*gnux32|uclinux*|gnu*|mint*|k*bsd*-gnu|cygwin|msys|mingw*|linux*uclibc)
+	CF_GNU_SOURCE($cf_XOPEN_SOURCE)
 	;;
 (minix*)
 	cf_xopen_source="-D_NETBSD_SOURCE" # POSIX.1-2001 features are ifdef'd with this...
@@ -3340,7 +4526,15 @@
 (netbsd*)
 	cf_xopen_source="-D_NETBSD_SOURCE" # setting _XOPEN_SOURCE breaks IPv6 for lynx on NetBSD 1.6, breaks xterm, is not needed for ncursesw
 	;;
-(openbsd[[4-9]]*)
+(openbsd[[6-9]]*)
+	# OpenBSD 6.x has broken locale support, both compile-time and runtime.
+	# see https://www.mail-archive.com/bugs@openbsd.org/msg13200.html
+	# Abusing the conformance level is a workaround.
+	AC_MSG_WARN(this system does not provide usable locale support)
+	cf_xopen_source="-D_BSD_SOURCE"
+	cf_XOPEN_SOURCE=700
+	;;
+(openbsd[[4-5]]*)
 	# setting _XOPEN_SOURCE lower than 500 breaks g++ compile with wchar.h, needed for ncursesw
 	cf_xopen_source="-D_BSD_SOURCE"
 	cf_XOPEN_SOURCE=600
@@ -3367,12 +4561,20 @@
 	;;
 (*)
 	CF_TRY_XOPEN_SOURCE
+	cf_save_xopen_cppflags="$CPPFLAGS"
 	CF_POSIX_C_SOURCE($cf_POSIX_C_SOURCE)
+	# Some of these niche implementations use copy/paste, double-check...
+	if test "$cf_cv_xopen_source" = no ; then
+		CF_VERBOSE(checking if _POSIX_C_SOURCE interferes with _XOPEN_SOURCE)
+		AC_TRY_COMPILE(CF__XOPEN_SOURCE_HEAD,CF__XOPEN_SOURCE_BODY,,[
+			AC_MSG_WARN(_POSIX_C_SOURCE definition is not usable)
+			CPPFLAGS="$cf_save_xopen_cppflags"])
+	fi
 	;;
 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
@@ -3382,20 +4584,20 @@
 	AC_MSG_CHECKING(if _XOPEN_SOURCE really is set)
 	AC_TRY_COMPILE([#include <stdlib.h>],[
 #ifndef _XOPEN_SOURCE
-make an error
+#error _XOPEN_SOURCE is not defined
 #endif],
 	[cf_XOPEN_SOURCE_set=yes],
 	[cf_XOPEN_SOURCE_set=no])
 	AC_MSG_RESULT($cf_XOPEN_SOURCE_set)
-	if test $cf_XOPEN_SOURCE_set = yes
+	if test "$cf_XOPEN_SOURCE_set" = yes
 	then
 		AC_TRY_COMPILE([#include <stdlib.h>],[
 #if (_XOPEN_SOURCE - 0) < $cf_XOPEN_SOURCE
-make an error
+#error (_XOPEN_SOURCE - 0) < $cf_XOPEN_SOURCE
 #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
@@ -3403,9 +4605,10 @@
 		CF_TRY_XOPEN_SOURCE
 	fi
 fi
+fi # cf_cv_posix_visible
 ])
 dnl ---------------------------------------------------------------------------
-dnl CF_X_ATHENA version: 23 updated: 2015/04/12 15:39:00
+dnl CF_X_ATHENA version: 25 updated: 2023/01/11 04:05:23
 dnl -----------
 dnl Check for Xaw (Athena) libraries
 dnl
@@ -3479,9 +4682,11 @@
 
 AC_CACHE_CHECK(for usable $cf_x_athena/Xmu package,cf_cv_xaw_compat,[
 AC_TRY_LINK([
+$ac_includes_default
 #include <X11/Xmu/CharSet.h>
 ],[
-int check = XmuCompareISOLatin1("big", "small")
+int check = XmuCompareISOLatin1("big", "small");
+(void)check;
 ],[cf_cv_xaw_compat=yes],[cf_cv_xaw_compat=no])])
 
 			if test "$cf_cv_xaw_compat" = no
@@ -3517,12 +4722,13 @@
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_X_ATHENA_CPPFLAGS version: 5 updated: 2010/05/26 17:35:30
+dnl CF_X_ATHENA_CPPFLAGS version: 9 updated: 2020/12/31 10:54:15
 dnl --------------------
 dnl Normally invoked by CF_X_ATHENA, with $1 set to the appropriate flavor of
 dnl the Athena widgets, e.g., Xaw, Xaw3d, neXtaw.
 AC_DEFUN([CF_X_ATHENA_CPPFLAGS],
 [
+AC_REQUIRE([AC_PATH_XTRA])
 cf_x_athena_root=ifelse([$1],,Xaw,[$1])
 cf_x_athena_inc=""
 
@@ -3533,10 +4739,10 @@
 	/usr/local
 do
 	if test -z "$cf_x_athena_inc" ; then
-		cf_save="$CPPFLAGS"
+		CF_SAVE_XTRA_FLAGS([CF_X_ATHENA_CPPFLAGS])
 		cf_test=X11/$cf_x_athena_root/SimpleMenu.h
-		if test $cf_path != default ; then
-			CPPFLAGS="$cf_save -I$cf_path/include"
+		if test "$cf_path" != default ; then
+			CF_APPEND_TEXT(CPPFLAGS,-I$cf_path/include)
 			AC_MSG_CHECKING(for $cf_test in $cf_path)
 		else
 			AC_MSG_CHECKING(for $cf_test)
@@ -3547,24 +4753,23 @@
 			[cf_result=yes],
 			[cf_result=no])
 		AC_MSG_RESULT($cf_result)
+		CF_RESTORE_XTRA_FLAGS([CF_X_ATHENA_CPPFLAGS])
 		if test "$cf_result" = yes ; then
-			cf_x_athena_inc=$cf_path
+			test "$cf_path"  = default && cf_x_athena_inc=default
+			test "$cf_path" != default && cf_x_athena_inc="$cf_path/include"
 			break
-		else
-			CPPFLAGS="$cf_save"
 		fi
 	fi
 done
 
 if test -z "$cf_x_athena_inc" ; then
-	AC_MSG_WARN(
-[Unable to successfully find Athena header files with test program])
+	AC_MSG_WARN([Unable to find Athena header files])
 elif test "$cf_x_athena_inc" != default ; then
-	CPPFLAGS="$CPPFLAGS -I$cf_x_athena_inc"
+	CF_APPEND_TEXT(CPPFLAGS,-I$cf_x_athena_inc)
 fi
 ])
 dnl ---------------------------------------------------------------------------
-dnl CF_X_ATHENA_LIBS version: 12 updated: 2011/07/17 19:55:02
+dnl CF_X_ATHENA_LIBS version: 14 updated: 2023/01/11 04:05:23
 dnl ----------------
 dnl Normally invoked by CF_X_ATHENA, with $1 set to the appropriate flavor of
 dnl the Athena widgets, e.g., Xaw, Xaw3d, neXtaw.
@@ -3589,29 +4794,27 @@
 		"-l$cf_lib -lXpm -lXmu" \
 		"-l${cf_lib}_s -lXmu_s"
 	do
-		if test -z "$cf_x_athena_lib" ; then
-			cf_save="$LIBS"
-			cf_test=XawSimpleMenuAddGlobalActions
-			if test $cf_path != default ; then
-				CF_ADD_LIBS(-L$cf_path/lib $cf_libs)
-				AC_MSG_CHECKING(for $cf_libs in $cf_path)
-			else
-				CF_ADD_LIBS($cf_libs)
-				AC_MSG_CHECKING(for $cf_test in $cf_libs)
-			fi
-			AC_TRY_LINK([
+		test -n "$cf_x_athena_lib" && break
+
+		CF_SAVE_XTRA_FLAGS([CF_X_ATHENA_LIBS])
+		cf_test=XawSimpleMenuAddGlobalActions
+		test "$cf_path" != default && cf_libs="-L$cf_path/lib $cf_libs"
+		CF_ADD_LIBS($cf_libs)
+		AC_MSG_CHECKING(for $cf_test in $cf_libs)
+		AC_TRY_LINK([
+$ac_includes_default
 #include <X11/Intrinsic.h>
 #include <X11/$cf_x_athena_root/SimpleMenu.h>
 ],[
 $cf_test((XtAppContext) 0)],
-				[cf_result=yes],
-				[cf_result=no])
-			AC_MSG_RESULT($cf_result)
-			if test "$cf_result" = yes ; then
-				cf_x_athena_lib="$cf_libs"
-				break
-			fi
-			LIBS="$cf_save"
+			[cf_result=yes],
+			[cf_result=no])
+		AC_MSG_RESULT($cf_result)
+		CF_RESTORE_XTRA_FLAGS([CF_X_ATHENA_LIBS])
+
+		if test "$cf_result" = yes ; then
+			cf_x_athena_lib="$cf_libs"
+			break
 		fi
 	done # cf_libs
 		test -n "$cf_x_athena_lib" && break
@@ -3623,6 +4826,7 @@
 [Unable to successfully link Athena library (-l$cf_x_athena_root) with test program])
 fi
 
+CF_ADD_LIBS($cf_x_athena_lib)
 CF_UPPER(cf_x_athena_LIBS,HAVE_LIB_$cf_x_athena)
 AC_DEFINE_UNQUOTED($cf_x_athena_LIBS)
 ])
@@ -3635,7 +4839,7 @@
 		[CF_ADD_LIB(Xext)])])
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_X_TOOLKIT version: 23 updated: 2015/04/12 15:39:00
+dnl CF_X_TOOLKIT version: 27 updated: 2023/01/11 04:05:23
 dnl ------------
 dnl Check for X Toolkit libraries
 AC_DEFUN([CF_X_TOOLKIT],
@@ -3643,7 +4847,7 @@
 AC_REQUIRE([AC_PATH_XTRA])
 AC_REQUIRE([CF_CHECK_CACHE])
 
-# OSX is schizoid about who owns /usr/X11 (old) versus /opt/X11 (new), and (and
+# OSX is schizoid about who owns /usr/X11 (old) versus /opt/X11 (new) (and
 # in some cases has installed dummy files in the former, other cases replaced
 # it with a link to the new location).  This complicates the configure script.
 # Check for that pitfall, and recover using pkg-config
@@ -3655,6 +4859,8 @@
 	CF_TRY_PKG_CONFIG(ice,,[AC_MSG_WARN(unable to find ICE library)])
 	CF_TRY_PKG_CONFIG(sm,,[AC_MSG_WARN(unable to find SM library)])
 	CF_TRY_PKG_CONFIG(xt,,[AC_MSG_WARN(unable to find Xt library)])
+else
+	LIBS="$X_PRE_LIBS $LIBS $X_EXTRA_LIBS"
 fi
 
 cf_have_X_LIBS=no
@@ -3668,6 +4874,7 @@
 # we have an "xt" package, but it may omit Xt's dependency on X11
 AC_CACHE_CHECK(for usable X dependency,cf_cv_xt_x11_compat,[
 AC_TRY_LINK([
+$ac_includes_default
 #include <X11/Xlib.h>
 ],[
 	int rc1 = XDrawLine((Display*) 0, (Drawable) 0, (GC) 0, 0, 0, 0, 0);
@@ -3686,8 +4893,9 @@
 
 AC_CACHE_CHECK(for usable X Toolkit package,cf_cv_xt_ice_compat,[
 AC_TRY_LINK([
+$ac_includes_default
 #include <X11/Shell.h>
-],[int num = IceConnectionNumber(0)
+],[int num = IceConnectionNumber(0); (void) num
 ],[cf_cv_xt_ice_compat=yes],[cf_cv_xt_ice_compat=no])])
 
 	if test "$cf_cv_xt_ice_compat" = no
@@ -3717,18 +4925,16 @@
 
 	AC_CHECK_FUNC(XOpenDisplay,,[
 	AC_CHECK_LIB(X11,XOpenDisplay,
-		[CF_ADD_LIB(X11)],,
-		[$X_PRE_LIBS $LIBS $X_EXTRA_LIBS])])
+		[CF_ADD_LIB(X11)])])
 
 	AC_CHECK_FUNC(XtAppInitialize,,[
 	AC_CHECK_LIB(Xt, XtAppInitialize,
 		[AC_DEFINE(HAVE_LIBXT,1,[Define to 1 if we can compile with the Xt library])
 		 cf_have_X_LIBS=Xt
-		 LIBS="-lXt $X_PRE_LIBS $LIBS $X_EXTRA_LIBS"],,
-		[$X_PRE_LIBS $LIBS $X_EXTRA_LIBS])])
+		 LIBS="-lXt $LIBS"])])
 ])
 
-if test $cf_have_X_LIBS = no ; then
+if test "$cf_have_X_LIBS" = no ; then
 	AC_MSG_WARN(
 [Unable to successfully link X Toolkit library (-lXt) with
 test program.  You will have to check and add the proper libraries by hand
@@ -3736,6 +4942,24 @@
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
+dnl CF__CURSES_DATA version: 3 updated: 2021/01/04 19:45:09
+dnl ---------------
+dnl Attempt to make a copy of a curses data item.  This is needed in the
+dnl check-data configure tests when using ncurses, because the symbol may be
+dnl actually a function return-value.  That could happen if the linker is
+dnl broken (does not resolve data-only references), or if ncurses is configured
+dnl to support re-entrant code.
+dnl $1 = target
+dnl $2 = source
+define([CF__CURSES_DATA],[
+#if defined($2) && ((defined(NCURSES_WRAPPED_VAR) && (NCURSES_VERSION_PATCH < 20200208)) || defined(NCURSES_BROKEN_LINKER) || defined(NCURSES_REENTRANT))
+	const void *$1 = (const void *)($2);
+#else
+	const void *$1 = &($2);
+#endif
+	fprintf(stderr, "testing linkage of $2:%p\\n", (const void *)$1);
+])dnl
+dnl ---------------------------------------------------------------------------
 dnl CF__CURSES_HEAD version: 2 updated: 2010/10/23 15:54:49
 dnl ---------------
 dnl Define a reusable chunk which includes <curses.h> and <term.h> when they
@@ -3755,3 +4979,21 @@
 #endif
 #endif
 ])
+dnl ---------------------------------------------------------------------------
+dnl CF__XOPEN_SOURCE_BODY version: 2 updated: 2023/02/18 17:41:25
+dnl ---------------------
+dnl body of test when test-compiling for _XOPEN_SOURCE check
+define([CF__XOPEN_SOURCE_BODY],
+[
+#ifndef _XOPEN_SOURCE
+#error _XOPEN_SOURCE is not defined
+#endif
+])
+dnl ---------------------------------------------------------------------------
+dnl CF__XOPEN_SOURCE_HEAD version: 2 updated: 2023/02/18 17:41:25
+dnl ---------------------
+dnl headers to include when test-compiling for _XOPEN_SOURCE check
+define([CF__XOPEN_SOURCE_HEAD],
+[
+$ac_includes_default
+])