That's an EXTREMELY vague question. Is there a ".tar" before the ".gz"? Often there will be. What you have to do is use the tar utility which, by itself, all it does is (un)bundle a whole bunch of files together but you can filter it through a compression app (like gzip or bzip2). So to uncompress the archive you've downloaded you would type tar -xzvf blahblah.tar.gz. To find out more about tar type man tar.
Then have a look at the contents of the archive. If you see files like "Makefile" and "configure" and a whole bunch or files ending in ".h" and ".c" then it's source code. To install that you'll need gcc (a c compuiler) and make (a helper app for compilers). Type each of those commands in (gcc and make) and if you don't get a "command not found" then you have them installed. In almost all cases to install a source package, the procedure is ./configure (from the directory you just uncomporessed), make and then you have to become root (by typing su and entering the root password) so you can do a make install. Each step has to succeed without error for the next step to work and all the steps need to be completed for the program to work.
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