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