--- ./rlogind/auth.c.orig	2000-01-05 21:26:21.000000000 -0600
+++ ./rlogind/auth.c	2018-04-10 02:19:01.197970828 -0500
@@ -33,6 +33,7 @@
 
 #include <sys/types.h>
 #include <pwd.h>
+#include <stddef.h>
 
 #include "rlogind.h"