--- scanfile.c.old	2010-08-30 07:41:31.000000000 +0200
+++ scanfile.c	2011-12-20 23:52:21.000000000 +0100
@@ -44,6 +44,7 @@
 #include "progress_bar.h"
 #include "raw2pdf.h"
 #include "scanmsg.h"
+#include "zlib.h"
 
 #define GRAY2MONO_BK		(0)
 #define GRAY2MONO_GRAY		(1)
@@ -386,7 +387,8 @@
 
 void write_data_for_png( png_structp png_ptr, png_bytep data, png_size_t length )
 {
-	FileControlWriteFile( *( (int *)png_ptr->io_ptr ), (CNMSLPSTR)data, length );
+        voidp write_io_ptr = png_get_io_ptr(png_ptr);
+	FileControlWriteFile( write_io_ptr, (CNMSLPSTR)data, length );
 
 	return;
 }