--- nxcomp/Pgn.cpp.orig	2006-06-27 11:25:12.000000000 +0200
+++ nxcomp/Pgn.cpp	2012-05-07 05:27:20.000000000 +0200
@@ -26,6 +26,7 @@
 #include <unistd.h>
 #include <stdio.h>
 #include <png.h>
+#include <pngpriv.h>
 
 #include "Unpack.h"
 #include "Pgn.h"