--- platform.h.orig	Thu Dec 17 11:20:40 1998
+++ platform.h	Wed Dec 23 17:04:27 1998
@@ -4,6 +4,7 @@
   See tidy.c for the copyright notice.
 */
 
+#include <sys/types.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>