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The easiest way to install the gEDA Suite is to grab the gEDA Binary Suite installer and use it. The instructions are contained in the README available on the downloads page.
Also, people have created RedHat RPMs, Debian Debs, and Mac OSX Fink packages if you prefer to install that way. These binary distributions are available on the downloads page. Finally, source tarballs for all programs are also available on the downloads page.