C++ Graphical debugger (and Motif related issue)

All,

Is anyone using a graphical debugger for c++ (like ddd for instance).

I’m trying to install ddd and it’s complaining that the Motif include file ‘Xm/Xm.h’ could not be found.

I don’t see a Motif (or lesstif) dev package to install - any help there would be great as well.

What are other people using?

Thanks,

Trefor