$OpenBSD$
--- null_out.c.orig	Thu Dec 22 17:30:58 2005
+++ null_out.c	Thu Dec 22 17:30:58 2005
@@ -15,7 +15,6 @@
 # include "config.h"
 #endif
 
-#define _XOPEN_SOURCE	500
 #include <unistd.h>
 
 #include "audio.h"
