In case you decide to compile MzScheme 372 from sources on a Fedora 10 box that has SELinux in enforcing mode, you need to take a few (simple) additional steps:

http://aadnyavali.wordpress.com/2009/06/07/making-arc-3-play...

I'm still downloading Fedora 11, but suspect that the same exercise will be needed for that as well.