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https://marc.info/?l=freeipmi-devel&m=166752785904895&w=2
From e3f759741ffc96c92c3a97e4518b09becce622b7 Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Fri, 4 Nov 2022 02:01:51 +0000
Subject: [PATCH 2/3] configure.ac: Fix detecting sighandler_t on glibc
Fixes the following error/misdetection of sighandler_t:
```
config.log:2639:conftest.c:83:13: error: 'sighandler_t' undeclared (first use in this function); did you mean 'sa_handler'?
```
sighandler_t requires -D_GNU_SOURCE on glibc systems.
Signed-off-by: Sam James <sam@gentoo.org>
--- a/configure.ac
+++ b/configure.ac
@@ -490,7 +490,8 @@ AC_CHECK_FUNCS([cbrt])
AC_CHECK_FUNCS([getmsg putmsg])
dnl sighandler_t apparently not defined in Apple/OS X
-AC_CHECK_TYPES([sighandler_t], [], [], [[#include <signal.h>]])
+AC_CHECK_TYPES([sighandler_t], [], [], [[#define _GNU_SOURCE
+#include <signal.h>]])
# At least on freebsd, putc_unlocked is a macro, so the standard
# AC_CHECK_FUNCS doesn't work well.
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