mandrake linux gtk+2.0 prblem

Hi all,
I am DESPERATE to use matplotlib on my linux box...Here is the problem,
according to my linux box, Gtk+2.0 and the corresponding libgtk developer
tools are installed. However, when I try to configure pygtk2.0 (needed by
matplotlib) I get an error saying that gtk+2.0 is not installed, (I
also tried (foolishly) to run a matplotlib example file with a gtk
backgroud and got a "gobject missing" error). Has anyone else had a
problem like this? Anyone know how to fix?