Just wondering if this is possible

[Exmortis]

Would it be possible to limit a races class choice?

To put this into perspective, I have just created 15 races for one of my custom campaigns. Class choice is limited by race in this world. Anthropomorphic races for example cannot be clerics, they may only be spirit based divine classes, such as Druid or Shaman.

Is there away for me to code that choice limitation in from the races side? I don't want to modify every class.