Neal Meyer wrote:

I'm trying to build a 64/32 bit universal application that uses boost. Is there a way to build a version of the boost libraries for this usage?

Neal, unfortunately, it is not possible with the released version of Boost. If you're using SVN trunk, you can do this: bjam architecture=x86 address-model=32_64 It is also possible to take last Boost release and replace tools/build/v2 and tools/jam with the SVN trunk version. This way, you'll be able to build 32/64 bit fat binary without the risk of bugs in trunk version of boost libraries. HTH, Volodya