For what it's worth, I do have some gpc packages for Fedora. My efforts to get it into the distribution proper have stalled because I've had problems getting it to work properly on ppc64, but perhaps soon I can start working on it again. My efforts succeed, you'd just install the compiler as any other package.
If anyone wants those packages, I'll be happy to update them. The last thing I built was gpc 20070904 on gcc 4.1.2; I don't even know how current that is. Sorry if you're running a different distribution.
- J<