I am having a linking issue with Boost.Test on my Mac OS X 10.5. Consider the following example: #define BOOST_TEST_DYN_LINK #include <boost/test/unit_test.hpp> void test() { } boost::unit_test::test_suite* init_unit_test_suite(int argc, char* argv[]) { boost::unit_test::test_suite* ts = BOOST_TEST_SUITE("test suite"); ts->add(BOOST_TEST_CASE(&test)); boost::unit_test::framework::master_test_suite().add(ts); return 0; } This does not compile with the following command: g++ test.cc -L/opt/local/lib -lboost_unit_test_framework-mt I am getting the following linker error: Undefined symbols: "_main", referenced from: start in crt1.10.5.o ld: symbol(s) not found collect2: ld returned 1 exit status It works, however, using the automatic test module definition, e.g. #define BOOST_TEST_DYN_LINK #define BOOST_TEST_MODULE foo #include <boost/test/unit_test.hpp> and works also when I remove BOOST_TEST_DYN_LINK and compile the program with the static library: g++ test.cc /opt/local/lib/libboost_unit_test_framework-mt.a But I can't get the first example code above to link. Does anyone see the problem lurking? Matthias -- Matthias Vallentin vallentin@icsi.berkeley.edu http://www.icir.org/matthias