--- play/unix/files.c.orig	Fri Oct 11 10:03:34 2013
+++ play/unix/files.c	Fri Oct 11 10:07:59 2013
@@ -14,7 +14,7 @@
 #endif
 #ifndef _XOPEN_SOURCE
 /* to get popen declared */
-#define _XOPEN_SOURCE 1
+#define _XOPEN_SOURCE 700
 #endif
 
 #include "config.h"