Hi, I was trying to follow the docs at http://www.boost.org/doc/libs/1_37_0/libs/test/doc/html/utf/user-guide/test-... I don't want to include everything, so I compile Boost.Test with dynamic linking. In this case I have to include two headers: #define BOOST_TEST_MODULE conditional_cost_experiments #include <boost/test/unit_test.hpp> #include <boost/test/unit_test_suite.hpp> // this one is also needed when linking!!! Maybe it would be better to include the latter header in the first? best regards -Thorsten