The Test library is failing to build on the Subversion trunk with the following error: darwin.compile.c++ ../../../../bin.v2/libs/test/build/darwin/debug/ link-static/execution_monitor.o ../../../../boost/test/impl/execution_monitor.ipp: In member function 'void boost::detail::system_signal_exception::report() const': ../../../../boost/test/impl/execution_monitor.ipp:426: error: 'SIGPOLL' was not declared in this scope ../../../../boost/test/impl/execution_monitor.ipp: In constructor 'boost::detail::signal_action::signal_action(int, bool, bool, char*)': ../../../../boost/test/impl/execution_monitor.ipp:527: error: expected id-expression before '(' token ../../../../boost/test/impl/execution_monitor.ipp: In constructor 'boost::detail::signal_handler::signal_handler(bool, int, bool, char*)': ../../../../boost/test/impl/execution_monitor.ipp:608: error: 'SIGPOLL' was not declared in this scope The definition of SIGPOLL in Mac OS X's signal.h is conditional: #if defined(_POSIX_C_SOURCE) #define SIGPOLL 7 /* pollable event ([XSR] generated, not supported) */ #else /* !_POSIX_C_SOURCE */ #define SIGIOT SIGABRT /* compatibility */ #define SIGEMT 7 /* EMT instruction */ #endif /* !_POSIX_C_SOURCE */ I'll be happy to test fixes, if that would help, but I'm too confused about the handling of SIGPOLL in execution_monitor.ipp to come up with my own patch. In one place, the use of SIGPOLL is guarded by ! defined(__CYGWIN__), in other places there doesn't seem to be such a guard. A little Googling notes that SIGPOLL is also missing on Cygwin, so I assume the Test library is broken on that platform, too. - Doug