Supporting multiple OS releases

In the freeIPA project we have our own SELinux policy. We support RHEL 5 up through Fedora Rawhide. With Fedora 11 we saw some problems compiling our SELinux module which Dan Walsh provided a patch for. I haven't tried this on older releases yet but I'm guessing it won't work as expected (some policies seem to have been renamed, such as corenet_non_ipsec_sendrecv() -> corenet_all_recvfrom_unlabeled() My question is, how can we handle this in our source tree? Are we going to need to maintain per-release policies or does SELinux support some sort of versioning conditionals? thanks rob