Index: alevt-1.6.2/exp-gfx.c
===================================================================
--- alevt-1.6.2.orig/exp-gfx.c
+++ alevt-1.6.2/exp-gfx.c
@@ -3,6 +3,8 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+/* libpng15's png.h doesn't include zlib.h */
+#include <zlib.h>
 
 #include "lang.h"
 #include "export.h"