Hello, including the header files "boost/date_time/local_time/local_time.hpp" and "boost/filesystem/operations.hpp" in this order results in the following compile error: 'boost::equivalent' : use of class template requires template argument list Swapping lines 1 and 2 of the following sample code works. I'm using MSVC 7.0, M$ Windows XP and boost-1.33.1 <code> #include // 1 // #include // 2 // int main(void) { return 0; } </code> Best Regards Markus