https://bugzilla.gnome.org/show_bug.cgi?id=769601
<answer><para>
The GTK+ <ulink url="http://www.gtk.org">website</ulink> offers some
-<ulink url="http://www.gtk.org/documentation">tutorials</ulink> and other
+<ulink url="http://www.gtk.org/documentation.php">tutorials</ulink> and other
documentation (most of it about GTK+ 2.x, but mostly still applicable).
More documentation ranging from whitepapers to online books can be found at
the <ulink url="http://developer.gnome.org">GNOME developer's site</ulink>.