GCC/G++ can build for just about anything, including PowerPC (what the cRio is), although I doubt a plain PowerPC build will work on the cRio, plus the WPIlib will probably not like not being run through its normal compiler.
Have you tried running any of this on
WINE? Then you can edit the files as you wish, then compile them in a sorta-native-running WindRiver (since Wine does not actually emulate, it is much faster then emulators/visualizers).
Another option you have is to use a SVN or similar repository server and then have a computer running Windows with WindRiver dedicated to building stuff and loading it to the cRio (possibly your Classmate.) This would also give you a central repository for all of your code, which would help with versioning and out-of-date code in builds.
It would have been better to start before kickoff. You should still be able to get it done in the next few days.