--- a/src/unix/qsh_unix.c
+++ b/src/unix/qsh_unix.c
@@ -17,6 +17,9 @@
  * 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 <sys/time.h>