[Boost-users] How to separate a specified library from Boost?

I want to use only the random library in Boost, and the whole Boost is too big for me. I remember there seems some tool that can strip off the dependency of the single library on the other libraries in Boost, and extracts it. But unfortunately I cannot recall the name of this tool. Could somebody give me some hints or suggestions on separating a library from Boost? Thanks a lot. Z.L.