--- Libc/Libc-1353.100.2/include/alloca.h
+++ Libc/Libc-320.1.3/include/alloca.h
@@ -25,14 +25,16 @@
 #define _ALLOCA_H_
 
 #include <sys/cdefs.h>
-#include <_types.h>
-#include <sys/_types/_size_t.h>
+#include <machine/ansi.h>
 
-#ifndef UNIFDEF_DRIVERKIT
+#ifndef	_BSD_SIZE_T_DEFINED_
+#define	_BSD_SIZE_T_DEFINED_
+typedef	_BSD_SIZE_T_	size_t;
+#endif
+
 __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 */