How to install g95: 1) Unpack the downloaded tarball (e.g. g95-x86-linux.tgz) in a directory of your choice: tar -zxvf g95-x86-linux.tgz 2) For your convenience, you can create another symbolic link from a directory in your $PATH (e.g. ~/bin) to the executable ln -s $PWD/g95-install/bin/*g95* ~/bin/g95 You should now be able to run g95 and create executables. To get a list of environment variables that control the library, run a compiled binary with the --g95 option, ie: ./a.out --g95 Have Fun!