--- /usr/include/sys/cdefs.h	2013-05-16 00:13:16.000000000 +0900
+++ /usr/lib/gcc/x86_64-gentoo-freebsd9.0/4.7.2/include-fixed/sys/cdefs.h	2013-03-07 00:21:28.000000000 +0900
@@ -1,3 +1,12 @@
+/*  DO NOT EDIT THIS FILE.
+
+    It has been auto-edited by fixincludes from:
+
+	"/usr/include/sys/cdefs.h"
+
+    This had to be done to correct non-standard usages in the
+    original, manufacturer supplied header file.  */
+
 /*-
  * Copyright (c) 1991, 1993
  *	The Regents of the University of California.  All rights reserved.
@@ -228,7 +237,7 @@
 #if defined(__cplusplus) && __cplusplus >= 201103L
 #define	_Alignas(e)		alignas(e)
 #define	_Alignof(e)		alignof(e)
-#define	_Noreturn		[[noreturn]]
+#define	_Noreturn		__attribute__((__noreturn__))
 #define	_Static_assert(e, s)	static_assert(e, s)
 /* FIXME: change this to thread_local when clang in base supports it */
 #define	_Thread_local		__thread