Since Perforce hasnt done much with Jam in the last few years, you might check The FreeType project. They've worked a bit on Jam, google ftjam to see what they've done.
I think you may want to use Boost Jam, which is an improvement over freetype's one.
http://www.boost.org/doc/tools/jam/index.html -- Adrien Destugues / PulkoMandy http://pulkomandy.ath.cx