can't catch mouse movement using gtk and gtkgl

["Dov B. Kruger" <dkruger stevens edu>]

I have previously written about my application, in which despite 
requesting all events, I am not seeing mouse wheel or mouse motion 
events. In desperation, I have stripped all my code out, and have a 
bare framework that uses the gtkglarea widget, leaving it blank. If 
some kind GTK+ expert would take the time to install the gtkgl package 
(which I enclose along with my stripped down main) you should be able 
to see that mouse motions  are only caught when entering or leaving the 
window, and most of the time, the mouse moving does nothing.

The code is in the following directory, along with the latest gtkglarea 
(version 1.99)
http://hudson.dl.stevens-tech.edu/code/gtkglerror/

Am I doing something wrong? Is there something wrong in gtkglarea?
I apologize for my simple Makefile, I have not learned automake yet, 
and my code is built with all the libraries in /opt, but it's just one 
file.

thanks for any help you can give!
Dov