...

... ?When I attempt to build boost on Mac/Linux with -DBOOST_FILESYSTEM_VERSION=3 ...

Whoa! That may be the problem.

When you compile your program it needs -DBOOST_FILESYSTEM_VERSION=3, but when you compile that boost libraries, you should not define anything special.

What does the bjam command you are using for building the boost libraries look like?

--Beman

I have discovered the issue. My apologies for wasting your time. My coworker built boost 1.44 (on Mac/Linux) with the CMake version of boost builds and the CMake version has a bug in that they don't include the v3 source in the final libraries. Once I modified CMakeLists.txt to add all the v3 source files for filesystem, everything is linking fine. BTW, I built boost on windows with bjam, which is why I never encountered the problem. Thanks again for the help. --Scott