From 2898ada3389bdf1a68da1cc975542b466b3cb045 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <icculus@icculus.org>
Date: Thu, 10 Nov 2016 12:07:34 -0500
Subject: [PATCH] wayland: fixed compiler warning about pipe2().

---
 src/video/wayland/SDL_waylanddatamanager.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/video/wayland/SDL_waylanddatamanager.c b/src/video/wayland/SDL_waylanddatamanager.c
index 809494762..afcec1a99 100644
--- a/src/video/wayland/SDL_waylanddatamanager.c
+++ b/src/video/wayland/SDL_waylanddatamanager.c
@@ -23,8 +23,10 @@
 
 #if SDL_VIDEO_DRIVER_WAYLAND
 
-#include <unistd.h>
+/* _GNU_SOURCE for pipe2 declaration. */
+#define _GNU_SOURCE
 #include <fcntl.h>
+#include <unistd.h>
 #include <limits.h>
 #include <signal.h>