http://repos.archlinux.org/wsvn/community/libmatchbox/trunk/PKGBUILD

--- libmb/mbpixbuf.c
+++ libmb/mbpixbuf.c
@@ -228,7 +228,7 @@
   if ((fd = fopen( file, "rb" )) == NULL) return NULL;
 
   fread( header, 1, 8, fd );
-  if ( ! png_check_sig( header, 8 ) ) 
+  if ( ! png_sig_cmp( header, 0, 8 ) == 0 ) 
     {
       fclose(fd);
       return NULL;