--- Libc/Libc-320/include/alloca.h
+++ Libc/Libc-1353.11.2/include/alloca.h
@@ -2,8 +2,6 @@
  * Copyright (c) 2003 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
@@ -27,16 +25,14 @@
 #define _ALLOCA_H_
 
 #include <sys/cdefs.h>
-#include <machine/ansi.h>
+#include <_types.h>
+#include <sys/_types/_size_t.h>
 
-#ifndef	_BSD_SIZE_T_DEFINED_
-#define	_BSD_SIZE_T_DEFINED_
-typedef	_BSD_SIZE_T_	size_t;
-#endif
-
+#ifndef UNIFDEF_DRIVERKIT
 __BEGIN_DECLS
 void	*alloca(size_t);		/* built-in for gcc */
 __END_DECLS
+#endif /* UNIFDEF_DRIVERKIT */
 
 #if defined(__GNUC__) && __GNUC__ >= 3
 /* built-in for gcc 3 */