Hi, I'm compiling Boost 1.48 on Solaris 10/gcc 4.6.2 for 32-bit and I use the following in my project-config.jam (it doesn't compile otherwise): using gcc : : : <compileflags>-mcpu=v9 <linkflags>-mcpu=v9 ; I am getting the following errors in numeric: ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:25:12: error: redefinition of 'struct boost::numeric::numeric_cast_traits<char, char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:13:12: error: previous definition of 'struct boost::numeric::numeric_cast_traits<char, char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:158:12: error: redefinition of 'struct boost::numeric::numeric_cast_traits<char, char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:13:12: error: previous definition of 'struct boost::numeric::numeric_cast_traits<char, char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:170:12: error: redefinition of 'struct boost::numeric::numeric_cast_traits<char, char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:13:12: error: previous definition of 'struct boost::numeric::numeric_cast_traits<char, char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:182:12: error: redefinition of 'struct boost::numeric::numeric_cast_traits<char, unsigned char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:37:12: error: previous definition of 'struct boost::numeric::numeric_cast_traits<char, unsigned char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:194:12: error: redefinition of 'struct boost::numeric::numeric_cast_traits<char, short int>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:49:12: error: previous definition of 'struct boost::numeric::numeric_cast_traits<char, short int>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:206:12: error: redefinition of 'struct boost::numeric::numeric_cast_traits<char, short unsigned int>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:61:12: error: previous definition of 'struct boost::numeric::numeric_cast_traits<char, short unsigned int>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:218:12: error: redefinition of 'struct boost::numeric::numeric_cast_traits<char, int>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:73:12: error: previous definition of 'struct boost::numeric::numeric_cast_traits<char, int>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:230:12: error: redefinition of 'struct boost::numeric::numeric_cast_traits<char, unsigned int>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:85:12: error: previous definition of 'struct boost::numeric::numeric_cast_traits<char, unsigned int>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:242:12: error: redefinition of 'struct boost::numeric::numeric_cast_traits<char, long long int>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:97:12: error: previous definition of 'struct boost::numeric::numeric_cast_traits<char, long long int>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:254:12: error: redefinition of 'struct boost::numeric::numeric_cast_traits<char, long long unsigned int>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:109:12: error: previous definition of 'struct boost::numeric::numeric_cast_traits<char, long long unsigned int>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:266:12: error: redefinition of 'struct boost::numeric::numeric_cast_traits<char, float>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:121:12: error: previous definition of 'struct boost::numeric::numeric_cast_traits<char, float>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:278:12: error: redefinition of 'struct boost::numeric::numeric_cast_traits<char, double>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:133:12: error: previous definition of 'struct boost::numeric::numeric_cast_traits<char, double>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:290:12: error: redefinition of 'struct boost::numeric::numeric_cast_traits<char, long double>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:145:12: error: previous definition of 'struct boost::numeric::numeric_cast_traits<char, long double>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:315:12: error: redefinition of 'struct boost::numeric::numeric_cast_traits<unsigned char, char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:303:12: error: previous definition of 'struct boost::numeric::numeric_cast_traits<unsigned char, char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:460:12: error: redefinition of 'struct boost::numeric::numeric_cast_traits<short int, char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:448:12: error: previous definition of 'struct boost::numeric::numeric_cast_traits<short int, char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:605:12: error: redefinition of 'struct boost::numeric::numeric_cast_traits<short unsigned int, char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:593:12: error: previous definition of 'struct boost::numeric::numeric_cast_traits<short unsigned int, char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:750:12: error: redefinition of 'struct boost::numeric::numeric_cast_traits<int, char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:738:12: error: previous definition of 'struct boost::numeric::numeric_cast_traits<int, char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:895:12: error: redefinition of 'struct boost::numeric::numeric_cast_traits<unsigned int, char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:883:12: error: previous definition of 'struct boost::numeric::numeric_cast_traits<unsigned int, char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:1040:12: error: redefinition of 'struct boost::numeric::numeric_cast_traits<long long int, char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:1028:12: error: previous definition of 'struct boost::numeric::numeric_cast_traits<long long int, char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:1185:12: error: redefinition of 'struct boost::numeric::numeric_cast_traits<long long unsigned int, char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:1173:12: error: previous definition of 'struct boost::numeric::numeric_cast_traits<long long unsigned int, char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:1330:12: error: redefinition of 'struct boost::numeric::numeric_cast_traits<float, char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:1318:12: error: previous definition of 'struct boost::numeric::numeric_cast_traits<float, char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:1475:12: error: redefinition of 'struct boost::numeric::numeric_cast_traits<double, char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:1463:12: error: previous definition of 'struct boost::numeric::numeric_cast_traits<double, char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:1620:12: error: redefinition of 'struct boost::numeric::numeric_cast_traits<long double, char>' ./boost/numeric/conversion/detail/preprocessed/numeric_cast_traits.hpp:1608:12: error: previous definition of 'struct boost::numeric::numeric_cast_traits<long double, char>' I guess it cannot tell apart int8_t and char.