This is why I mentioned it. It provides improved time guarantees for your users with out needing another library.

bcrypt is open source and ported to a range of operating systems. I cannot imagine getting it up and running on any system would be too difficult. It would probably be wiser to to spend the time to get bcrypt (or another standard scheme) working rather than coming up with some custom scheme which probably hasn't had the same level of thought put into it.