[Boost-users] fusion library not in boost 1.34.1?

Hi, I've been working out of the development branch for boost for a while and I always took for granted that fusion was part of the library. However, after downgrading back to 1.34.1, I notice it isn't in there. Is there a reason for this? How do I go about downloading a version of fusion that will work with 1.34.1? Thanks.