diff -ur pips-common-3.7.0/Core/pips-filter/pfimg.h pips-common-3.7.0-png/Core/pips-filter/pfimg.h
--- pips-common-3.7.0/Core/pips-filter/pfimg.h	2009-05-21 14:37:33.000000000 +0400
+++ pips-common-3.7.0-png/Core/pips-filter/pfimg.h	2010-09-15 17:58:57.000000000 +0400
@@ -31,6 +31,9 @@
 #ifndef __PF_IMG_H__
 #define __PF_IMG_H__
 
+#define png_infopp_NULL (png_infopp)NULL
+#define int_p_NULL (int*)NULL
+
 #include <png.h>
 #include "pips-prtlib.h"