From da4b42688a6cd5444eefb91bf40183d88203ffca Mon Sep 17 00:00:00 2001
From: Mojca Miklavec <mojca@macports.org>
Date: Sat, 5 Nov 2022 13:22:25 +0100
Subject: [PATCH] Fix implicit declaration configuration errors with Xcode 12

Some configure could fail with errors like the following:

conftest.c:56:33: error: implicitly declaring library function 'exit'
with type 'void (int) __attribute__((noreturn))'
[-Werror,-Wimplicit-function-declaration]

See https://trac.macports.org/ticket/61672

Closes #22946.
---
 configure    | 6 +++++-
 configure.in | 6 +++++-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index 609753031f..bab062b4a2 100755
--- a/configure
+++ b/configure
@@ -25421,6 +25421,7 @@ else
 
                     #include <zlib.h>
                     #include <stdio.h>
+                    #include <stdlib.h>
 
                     int main()
                     {
@@ -25560,6 +25561,7 @@ else
 
                     #include <png.h>
                     #include <stdio.h>
+                    #include <stdlib.h>
 
                     int main()
                     {
@@ -36219,7 +36221,9 @@ if ${wx_cv_inotify_usable+:} false; then :
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-int main() { return inotify_init(); }
+
+                       #include <sys/inotify.h>
+                       int main() { return inotify_init(); }
 _ACEOF
 if ac_fn_c_try_link "$LINENO"; then :
   wx_cv_inotify_usable=yes
diff --git a/configure.in b/configure.in
index 3e68b66f9c..a21d8531ba 100644
--- a/configure.in
+++ b/configure.in
@@ -2215,6 +2215,7 @@ if test "$wxUSE_ZLIB" != "no" ; then
                 [
                     #include <zlib.h>
                     #include <stdio.h>
+                    #include <stdlib.h>
 
                     int main()
                     {
@@ -2300,6 +2301,7 @@ if test "$wxUSE_LIBPNG" != "no" ; then
                 [
                     #include <png.h>
                     #include <stdio.h>
+                    #include <stdlib.h>
 
                     int main()
                     {
@@ -5086,7 +5088,9 @@ if test "$wxUSE_FSWATCHER" = "yes"; then
                 [whether inotify is usable],
                 wx_cv_inotify_usable,
                 AC_LINK_IFELSE(
-                    [AC_LANG_SOURCE([int main() { return inotify_init(); }])],
+                    [AC_LANG_SOURCE([
+                       #include <sys/inotify.h>
+                       int main() { return inotify_init(); }])],
                     [wx_cv_inotify_usable=yes],
                     [wx_cv_inotify_usable=no]
                 )