Hi, I am trying to build the libraries for the Boost test framework myself (using my own CMake files) instead of using bjam. When trying to link the file execution_monitor.cpp debug.cpp cpp_main.cpp into a dynamic library libboost_prg_exec_monitor.dylib I get the following linker erros: Linking CXX shared library libboost_prg_exec_monitor.dylib ld: warning: duplicate dylib /usr/lib/libpthread.dylib Undefined symbols: "boost::debug::attach_debugger(bool)", referenced from: _execution_monitor_attaching_signal_handler in execution_monitor.cpp.o "boost::debug::under_debugger()", referenced from: boost::execution_monitor::execute(boost::unit_test::callback0<int> const&)in execution_monitor.cpp.o Do I need to link additional files? Matthias