How to uninstall from a source file
 

What is the easiest way to uninstall a linux program that I've just compiled and installed from a file with the extension, tar.gz?

you just need to remove all of it's related files. if there are configs for it in /etc or ~/ somewhere... any executables that are in /usr/bin... whatever... if it was just installed from source, not using a package manager.. all you need to do are remove it's relevant files. The trick may be finding out what all was installed with it. ;)

Go into the directory where you built the source origingally then do
If you deleted your originaly build directory just unpack the source and run configure (with the same prefix option if you specified any) then try running make uninstall (you may need to run make first, I'm not sure).