--- Libc/Libc-763.13/include/alloca.h
+++ Libc/Libc-997.90.3/include/alloca.h
@@ -26,11 +26,7 @@
 
 #include <sys/cdefs.h>
 #include <_types.h>
-
-#ifndef	_SIZE_T
-#define	_SIZE_T
-typedef	__darwin_size_t	size_t;
-#endif
+#include <sys/_types/_size_t.h>
 
 __BEGIN_DECLS
 void	*alloca(size_t);		/* built-in for gcc */