[boost] Suddenly unresolved symbols show up on the trunk

Hello, I number of string tests just started failing with the following error: ld: Unresolved: boost::debug::under_debugger(void) boost::debug::attach_debugger(bool) boost::debug::detect_memory_leaks(bool) boost::debug::break_memory_alloc(long) boost::debug::set_debugger(boost::unit_test::basic_cstring<const char>, boost::unit_test::callback1<const boost::debug::d For example: libs/algorithm/string/test/predicate.test libs/algorithm/string/test/find.test libs/algorithm/string/test/regex.test What happened? Markus