gentoo-overlay/games-fps/quake2-icculus/files/quake2-icculus-0.16.1-gnusource.patch

--- a/src/linux/q_shlinux.c
+++ b/src/linux/q_shlinux.c
@@ -17,6 +17,9 @@
 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
 */
+#if !defined(_GNU_SOURCE)
+	#define _GNU_SOURCE
+#endif
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <errno.h>