--- pngcrush-1.7.71.old/zutil.c
+++ pngcrush-1.7.71/zutil.c
@@ -7,7 +7,7 @@
 
 #include "zutil.h"
 #ifndef Z_SOLO
-#  include "gzguts.h"
+// #  include "gzguts.h"
 #endif
 
 #ifndef NO_DUMMY_DECL