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https://gitlab.com/sane-project/backends/-/merge_requests/763
From 300b460970f538ab515835f14650785e88808a8f Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Fri, 4 Nov 2022 04:04:46 +0000
Subject: [PATCH] acinclude.m4: fix -Wimplicit-function-declaration
-Wimplicit-function-declaration will become an error by default
in Clang 16.
Fixes errors like:
```
error: call to undeclared library function 'exit' with type 'void (int) __attribute__((noreturn))'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
```
Signed-off-by: Sam James <sam@gentoo.org>
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -471,6 +471,7 @@ AC_DEFUN([SANE_CHECK_IPV6],
if test "$ipv6" != "no" ; then
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#define INET6
+ #include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h> ]], [[
/* AF_INET6 available check */
@@ -492,6 +493,7 @@ AC_DEFUN([SANE_CHECK_IPV6],
AC_MSG_CHECKING([whether struct sockaddr_storage has an ss_family member])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#define INET6
+ #include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h> ]], [[
/* test if the ss_family member exists in struct sockaddr_storage */
@@ -504,6 +506,7 @@ AC_DEFUN([SANE_CHECK_IPV6],
], [
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#define INET6
+ #include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h> ]], [[
/* test if the __ss_family member exists in struct sockaddr_storage */
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