Greetings, I was just looking at the <boost/config/select_compiler_config.hpp> file and noticed an error (I think). For what it's worth, Symantec C++ is now Digital Mars C++ but it is currently checked under MPW: ... 19 #elif defined __DMC__ 20 // Digital Mars C++ 21 # define BOOST_COMPILER_CONFIG "boost/config/compiler/ digitalmars.hpp" ... 63 #elif defined(__MRC__) || defined(__SC__) 64 // MPW MrCpp or SCpp 65 # define BOOST_COMPILER_CONFIG "boost/config/compiler/ mpw.hpp" ... I think it should be: ... 19 #elif defined __DMC__ || defined __SC__ 20 // Digital Mars C++ 21 # define BOOST_COMPILER_CONFIG "boost/config/compiler/ digitalmars.hpp" ... 63 #elif defined(__MRC__) 64 // MPW MrCpp 65 # define BOOST_COMPILER_CONFIG "boost/config/compiler/ mpw.hpp" ... Eric.