Still lots of
difficult ( for me) X11 coding to be done, [...]
I would recommend using wxWidgets
<http://www.wxwidgets.org> as your
GUI layer.
If you still want to write directly atop Xlib, for any reason, I can
perhaps help; I've done a fair bit of X code using nothing above Xlib.
(Yes, I know the Henry Spencer quote. I disagree with him.)
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