--- lib/gif_hash.c.orig	2013-09-03 08:41:31.000000000 -0500
+++ lib/gif_hash.c	2020-06-26 14:43:00.000000000 -0500
@@ -21,6 +21,7 @@
 #include <fcntl.h>
 #include <stdio.h>
 #include <string.h>
+#include <stdlib.h>
 
 #include "gif_lib.h"
 #include "gif_hash.h"