--- Libc/Libc-320/include/standards.h
+++ Libc/Libc-583/include/standards.h
@@ -2,8 +2,6 @@
  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
  *
  * @APPLE_LICENSE_HEADER_START@
- * 
- * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
  * 
  * This file contains Original Code and/or Modifications of Original Code
  * as defined in and that are subject to the Apple Public Source License
@@ -29,11 +27,13 @@
 #ifndef _STANDARDS_H
 #define _STANDARDS_H
 
-#ifdef _POSIX_SOURCE
+#include <sys/cdefs.h>
+
+#if defined(_POSIX_C_SOURCE) && !defined(_DARWIN_C_SOURCE)
 #        ifndef __STRICT_ANSI__
 #                define __STRICT_ANSI__
 #        endif
 #        undef __STRICT_BSD__
-#endif /* _POSIX_SOURCE */
+#endif /* (_POSIX_C_SOURCE && !_DARWIN_C_SOURCE) */
 
 #endif /* _STANDARDS_H */