If you control the environment under which you're operating, it should be as simple as using your distribution's package manager to install libgc or possibly libgc-dev. If your package manager doesn't have a package for libgc, you'll have to download and install it yourself (which probably isn't that hard, but it's more annoying). If you don't control the environment, you should talk to your system admin (Zeno, IIRC?) and ask to have the package installed. It is possible but tedious to install the library manually even if you don't control the environment; I'd not recommend that unless you reallyreally have to.