gtk layering

["Bill Cunningham" <billcm charter net>]

    I know for those of us who want to use gtk as an API it is there. Gnome
is built on gtk of course. But what about gtk? Does it call directly glib or
the X windowing system for frame buffer support?

gtk
glib-2
x windows

or does gtk work more like this?
gtk
/    \
glib X

Simplified of course then there's pango and cairo and pangocairo.. :)

Bill