From ec1778a37f34ae15ddc3dddf4fd452de195672be Mon Sep 17 00:00:00 2001
From: Christopher Fore <csfore@posteo.net>
Date: Thu, 14 Dec 2023 23:17:11 -0500
Subject: [PATCH] backends: Include unistd.h to fix compilation on musl

Musl doesn't seem to include this by default so explicitly including it
should fix compilation on Musl.

Tested with Clang 16/17 and GCC 14.

Error:
src/backends/meta-fd-source.c:70:3: error: call to undeclared function 'close'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
  close (fd_source->poll_fd.fd);
  ^

Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/3078
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3455>
---
 src/backends/meta-fd-source.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/backends/meta-fd-source.c b/src/backends/meta-fd-source.c
index d66c7b748..73989bf15 100644
--- a/src/backends/meta-fd-source.c
+++ b/src/backends/meta-fd-source.c
@@ -20,6 +20,8 @@
 
 #include "config.h"
 
+#include <unistd.h>
+
 #include "backends/meta-fd-source.h"
 
 typedef struct _MetaFdtSource