--- graphviz-2.26.0/lib/gd/gd_png.c.ark	2010-01-08 14:02:42.810241098 +0000
+++ graphviz-2.26.0/lib/gd/gd_png.c	2010-01-08 14:04:17.316903953 +0000
@@ -150,7 +150,7 @@ BGD_DECLARE(gdImagePtr) gdImageCreateFro
 	return NULL;
   }
 
-	if (!png_check_sig (sig, 8)) { /* bad signature */
+	if (!png_sig_cmp (sig, 0, 8)) { /* bad signature */
     	return NULL;		/* bad signature */
 	}