--- sys/sys/ucontext.h.orig	2012-01-31 12:50:57.702804441 +0800
+++ sys/sys/ucontext.h	2012-01-31 12:51:26.217639882 +0800
@@ -69,6 +69,11 @@
 
 #ifndef _KERNEL
 
+#ifndef _SIZE_T_DECLARED
+typedef	__size_t	size_t;
+#define	_SIZE_T_DECLARED
+#endif
+
 __BEGIN_DECLS
 
 int	getcontext(ucontext_t *);