From dacf2ad2b3266e9877b82d0420fca67b0cba8615 Mon Sep 17 00:00:00 2001
From: Christian Hergert <chergert@redhat.com>
Date: Mon, 6 Jul 2020 16:08:44 -0700
Subject: [PATCH] build: fix warning

---
 examples/app.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/examples/app.c b/examples/app.c
index abb45aa6..03adf85d 100644
--- a/examples/app.c
+++ b/examples/app.c
@@ -5,7 +5,9 @@
  * to the capture from your application.
  */
 
-#define _GNU_SOURCE
+#ifndef _GNU_SOURCE
+# define _GNU_SOURCE
+#endif
 
 #ifdef __linux__
 # include <sched.h>