Where are GTK devel packages?

["Thomas H. George" <lists@tomgeorge.info>]

I am trying to run fakeroot debian/rules binary to install mplayer.  The 
program aborts with the message, " the GUI requires GTK devel packages 
(which were not found)"

My setup is Sarge with XWindows started with gdm but I probably do not 
have the whole Gnome package installed as I normally use icewm.  I don't 
need a lot of bells and whistles as the programs I use: openoffice, 
xfig, gimp, cups, pysol and mozilla work fine but I would like to add 
mplayer-plugin to watch TV clips.

Tom George