[Bordeaux-threads-devel] No Thread Support on Darwin SBCL

I've just started developing in LISP, again, after some years away from it. I wanted to try using Hunchentoot which requires the Bordeaux Threads project. After asdf-installing the project, I REPLd (require :bordeaux-threads) and received the following message:

WARNING: Either there is no Bordeaux-threads support for your implementation, or your implementation does not support threads therefore some features may not work. Feel free to implement it, or bug one of the maintainers to do so if your lisp supports threads at all.

I'm running Mac OS X 10.5, SBCL 1.0.30, and Bordeaux-Threads 0.6.0. Does anyone know why I don't have thread support though it appears to have a "green" status on the project page?

Sincerely, Curtis.