$OpenBSD: patch-src_libthread_threadimpl_h,v 1.1.1.1 2012/06/26 15:07:17 pascal Exp $
--- src/libthread/threadimpl.h.orig	Thu Oct 27 21:23:52 2011
+++ src/libthread/threadimpl.h	Thu Oct 27 21:24:31 2011
@@ -56,6 +56,8 @@ extern	void		makecontext(ucontext_t*, void(*)(), int, 
 #	define ucontext_t libthread_ucontext_t
 #	if defined __i386__
 #		include "386-ucontext.h"
+#	elif defined __amd64__
+#		include "x86_64-ucontext.h"
 #	else
 #		include "power-ucontext.h"
 #	endif