Thunar-vfs GIT uses png_check_sig(sig, num), but this function is deprecated since libpng0.9 and replaced by !png_sig_cmp(sig, 0, num), so thunar-vfs fails to build with libpng>=1.4, which doesn't include png_check_sig(sig, num) anymore. thunar-vfs-thumb.c: In function 'IA__thunar_vfs_thumbnail_is_valid': thunar-vfs-thumb.c:1172: error: implicit declaration of function 'png_check_sig'
Created attachment 2930 0001-Replace-png_sig_check-with-png_sig_cmp.patch
Upstream libpng re-implemented png_check_sig as a compat macro if I remember correctly, but regardless, this is no longer a valid bug :-)
Oops, it was fixed: http://git.xfce.org/xfce/thunar-vfs/commit/?id=080ed7114e9d6c5cbe56ff582172b7eef0a81e8a