Hi, I am using the UTF in my code. Below is the key component of my code that I have been using on Mac for a few years with boost installed from macports. #define BOOST_TEST_DYN_LINK #define BOOST_TEST_MODULE MAST_TESTS #include <boost/test/unit_test.hpp> // C++ includes #include <memory> struct GlobalTestFixture { GlobalTestFixture() { /* my code here */ } ~GlobalTestFixture() { } }; BOOST_GLOBAL_FIXTURE( GlobalTestFixture ); A few days ago I started using this code on Ubuntu and kept getting segmentation faults with random values being returned for boost::unit_test::framework::master_test_suite().argc I managed to get rid of this problem by changing the included header to #include <boost/test/included/unit_test.hpp> I have seen the description here: http://www.boost.org/doc/libs/1_48_0/libs/test/doc/html/utf/compilation/dire... <http://www.boost.org/doc/libs/1_48_0/libs/test/doc/html/utf/compilation/direct-include.html>. However, I am not quite able to follow why this problem occurred on Ubuntu (with system boost library) when I was still linking against the precompiled library (version 1.58). Is there a test I can include in my code to automatically switch from one include to the other? I will appreciate some guidance. Regards, Manav