$OpenBSD: patch-include_u_h,v 1.1.1.1 2012/06/26 15:07:17 pascal Exp $
--- include/u.h.orig	Thu Oct 27 21:28:18 2011
+++ include/u.h	Thu Oct 27 21:28:57 2011
@@ -116,6 +116,8 @@ typedef long p9jmp_buf[sizeof(sigjmp_buf)/sizeof(long)
 #	undef _NEEDULONG
 #elif defined(__OpenBSD__)
 #	include <sys/types.h>
+#	include <pthread.h>
+#	define PLAN9PORT_USING_PTHREADS 1
 #	undef _NEEDUSHORT
 #	undef _NEEDUINT
 #	undef _NEEDULONG
