gentoo-overlay/media-video/alevt/files/alevt-1.6.2-libpng15.patch

--- a/exp-gfx.c
+++ b/exp-gfx.c
@@ -4,6 +4,8 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include <zlib.h> /* Z_DEFAULT_COMPRESSION */
+
 #include "lang.h"
 #include "export.h"