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https://github.com/FeralInteractive/gamemode/pull/368

From 4079d246805e9ce6c1f5ee49116013eb9f5225d7 Mon Sep 17 00:00:00 2001
From: Alfred Persson Forsberg <cat@catcream.org>
Date: Tue, 5 Jul 2022 17:18:19 +0000
Subject: [PATCH] Fix build on musl libc

This simple patch includes signal.h in daemon/gamemode-context.c to fix building gamemode on musl
libc.

This has been tested Gentoo musl and Alpine (also Gentoo glibc to
ensure no multiple defined symbols/other errors for glibc).

> ../daemon/gamemode-context.c: In function 'game_mode_context_auto_expire':
> ../daemon/gamemode-context.c:421:29: error: implicit declaration of function 'kill' [-Werror=implicit-function-declaration]
>   421 |                         if (kill(client->pid, 0) != 0) {
>       |                             ^~~~
> ../daemon/gamemode-context.c:421:29: warning: nested extern declaration of 'kill' [-Wnested-externs]

Signed-off-by: Alfred Persson Forsberg <cat@catcream.org>
---
 daemon/gamemode-context.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/daemon/gamemode-context.c b/daemon/gamemode-context.c
index 3b5a61b..feba2b1 100644
--- a/daemon/gamemode-context.c
+++ b/daemon/gamemode-context.c
@@ -45,6 +45,7 @@ POSSIBILITY OF SUCH DAMAGE.
 #include <assert.h>
 #include <fcntl.h>
 #include <pthread.h>
+#include <signal.h>
 #include <stdatomic.h>
 #include <stdlib.h>
 #include <sys/time.h>
-- 
2.35.1