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https://github.com/linux-pam/linux-pam/pull/490
From 5fccc4cbac82b4677af28b59e7a657c86acab7fc Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Sun, 11 Sep 2022 16:37:59 +0100
Subject: [PATCH] configure.ac: fix implicit function declaration in mail spool
directory check
Fixes the following error with Clang 15 (which makes implicit function
declarations an error by default):
```
+error: call to undeclared library function 'exit' with type 'void (int) __attribute__((noreturn))'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
exit(0);
^
note: include the header <stdlib.h> or explicitly provide a declaration for 'exit'
```
Signed-off-by: Sam James <sam@gentoo.org>
--- a/configure.ac
+++ b/configure.ac
@@ -297,6 +297,7 @@ if test x$with_mailspool != x ; then
else
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <paths.h>
+#include <stdlib.h>
int main() {
#ifdef _PATH_MAILDIR
exit(0);
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