The most important goal of C::B is portability across platforms. Because of this, external dependencies are kept to a minimum.
To build C::B you need wxWidgets, STC (in wxWidgets contrib) and TinyXML (included).
I don't own a Mac to try it but I guess that it would build succesfully as it is now. I mean, if wxWidgets is available for Mac, I see no reason for C::B to fail compiling there.
Yiannis.