I'm not sure there's a good solution to this, but enough projects are using "gen_server2" that we're getting collisions. Maybe append a random hash to the mod name? :)
In particular, rabbitmq has one of these puppies. I think riak does as well.
Sorry I'm picking on this project, I should in good conscience I should raise this everywhere. In fact, I think I will :)
Feel free to mark as wontfix, but I wanted to at least raise it.