Run Boost unit test with my own main function for debugging

I have a library inside which there are some testing programs written using Boost.Test. The test files don't have #define BOOST_TEST_DYN_LINK or #include <boost/test/included/unit_test.hpp>. They only have #include <boost/test/unit_test.hpp>. So the main() function isn't there implicitly.

Now I have to debug some library functions which have been used in the test cases. Given that I cannot add or change anything in the test programs, how can I invoke the test programs under a debugger ?