--- pngwutil.c-1.2.14	2006-11-28 17:25:59.000000000 +0100
+++ pngwutil.c-1.2.15rc5	2006-12-29 21:16:19.000000000 +0100
@@ -1,7 +1,7 @@
 
 /* pngwutil.c - utilities to write a PNG file
  *
- * Last changed in libpng 1.2.13 November 13, 2006
+ * Last changed in libpng 1.2.15 December 31, 2006
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2006 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -757,8 +757,11 @@
       profile_len = 0;
 
    if (profile_len > 3)
-      embedded_profile_len = ((*(profile  ))<<24) | ((*(profile+1))<<16) |
-          ((*(profile+2))<< 8) | ((*(profile+3))    );
+      embedded_profile_len =
+          ((*( (png_bytep)profile  ))<<24) |
+          ((*( (png_bytep)profile+1))<<16) |
+          ((*( (png_bytep)profile+2))<< 8) |
+          ((*( (png_bytep)profile+3))    );
 
    if (profile_len < embedded_profile_len)
      {