I was able to successfully compile the boost libraries for x64 under VC 8.0 using the following line: bjam "-sTOOLS=vc-8_0-amd64" As far as I can tell everything was successful (see note at end of message). There was, of course, a vast quantity of warnings, but all of the lib files seem to be there. Then I tried creating an app using regex. The test code essentially boils down to this: #include <boost/regex.hpp> bool testregex( const char* StringToMatch ) { return( boost::regex_match( StringToMatch, boost::regex("[A-Z]+") ) ); } It compiles fine, but fails to resolve three regex related functions in the linker. Paraphrasing to make it a little more readable (if you want to see the full text, let me know): basic_regex<char, regex_traits<char,w32_regex_traits<char> > >::do_assign re_detail::perl_matcher<...>::match re_detail::perl_matcher<...>::perl_matcher [constructor] All three of these functions reference boost::w32_regex_traits. Perhaps this is where the problem lies? Should it be w64_regex_traits? Am I missing a define somewhere? Any ideas? As an aside: I was only able to compile the boost libraries on a 64-bit machine. Running bjam on a 32-bit machine kept popping up a message box saying that (vc2005path...)\amd64\cl.exe was not a valid executable. Apparently the bjam configuration wants to use a true 64-bit executable version of cl. I wasn't even aware that any part of VS2005 was actually 64-bit. I thought it was a 32-bit application that could compile/link 64-bit executables. I certainly can compile 64-bit apps under the IDE. Anyway, I only mention this in case it somehow relates to the underlying problem. Thanks, -- Bill --