http://bugs.libming.org/show_bug.cgi?id=120
https://github.com/libming/libming/commit/c67923dac4177bcf66b04b02b67675265727fb26
--- src/libming.h.orig
+++ src/libming.h
@@ -77,6 +76,7 @@
 #endif
 
 #if GIFLIB_GIFERRORSTRING
+#include <gif_lib.h>
 static void
 PrintGifError(void)
 {