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https://github.com/tcltk/tcl/commit/5eb33c5c7e9d6b703275b680f337691ecfe38f2a
From 5eb33c5c7e9d6b703275b680f337691ecfe38f2a Mon Sep 17 00:00:00 2001
From: "jan.nijtmans" <nijtmans@users.sourceforge.net>
Date: Sun, 7 Nov 2021 21:34:08 +0000
Subject: [PATCH] Fix [15845d9fd8]: unix/tcl.m4: implicit declaration of exit()
in timezone variable checks
--- a/unix/tcl.m4
+++ b/unix/tcl.m4
@@ -2349,7 +2349,8 @@ AC_DEFUN([SC_TIME_HANDLER], [
# (like convex) have timezone functions, etc.
#
AC_CACHE_CHECK([long timezone variable], tcl_cv_timezone_long, [
- AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <time.h>]],
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <time.h>
+#include <stdlib.h>]],
[[extern long timezone;
timezone += 1;
exit (0);]])],
@@ -2361,7 +2362,8 @@ AC_DEFUN([SC_TIME_HANDLER], [
# On some systems (eg IRIX 6.2), timezone is a time_t and not a long.
#
AC_CACHE_CHECK([time_t timezone variable], tcl_cv_timezone_time, [
- AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <time.h>]],
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <time.h>
+#include <stdlib.h>]],
[[extern time_t timezone;
timezone += 1;
exit (0);]])],
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