you would need to look into one of many gui development libraries available for Linux
you have glib, gtk, wxWidgets,Qt,motif,openGL, and lesstif to name a few
pick one and learn it's API, this should get you started, just make sure you have not only the library installed but the -devel package for it as well
some of them will be more cross compatible than others so when choosing your library, make sure you have in mind what your goal is for the program you are writing, and what the target is (linux only, multiple *NIX versions, *nix/windows etc...)
hope this helps
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