[ale] Help with packages

[ringo]

I'm running Suse 9.2 pro on a laptop. It's a brand new install.

When I try to compile a program I get the following errors:
stage.h:62:63: glib.h: No such file or directory
rtk.h:32:21: gtk/gtk.h: No such file or directory

I was told this means that I don't have the GTK develop stuff installed.

I went to KPackage and did a search for gtk and it finds things like gtk
and python-gtk but if I "Mark" any of them then the only button that
lights up is "uninstall", so I'm assuming that means that they are
already installed. What am I missing here?
Thanks
Ringo