Re: installing gsl package
If you installed it as a .tar package, using configure, make, make install and there were no errors it installed correctly. Now you need to figure out where the executable is so you can run the program. Fedora 7 is EOL, way past EOL for that matter. You'll have a lot of problems trying to use yum to install anything at all as the repositories have been moved and / or closed.
Moved to EOL (End Of Life) Versions.
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