From de0c378aa253551d36eb5b681c34598a19efa0c3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tom=C3=A1=C5=A1=20Mr=C3=A1z?= <tomas.mraz@zona64.cz>
Date: Tue, 3 Mar 2026 16:10:20 +0100
Subject: [PATCH] Wayland: Conditionally define _GNU_SOURCE

This fixes a re-definition warning for the _GNU_SOURCE macro.

Edited by elmindreda: code formatting, author credit

Related to go-gl/glfw#359
Fixes #2833
---
 CONTRIBUTORS.md | 1 +
 src/wl_window.c | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index 6b453e72..9705af14 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -183,6 +183,7 @@ video tutorials.
  - Jon Morton
  - Pierre Moulon
  - Martins Mozeiko
+ - Tomáš Mráz
  - Pascal Muetschard
  - James Murphy
  - Julian Møller
diff --git a/src/wl_window.c b/src/wl_window.c
index 468360fe..7d0a8309 100644
--- a/src/wl_window.c
+++ b/src/wl_window.c
@@ -24,7 +24,9 @@
 //
 //========================================================================
 
-#define _GNU_SOURCE
+#if !defined(_GNU_SOURCE)
+ #define _GNU_SOURCE
+#endif
 
 #include "internal.h"