The logic used here seems to be completely and totally broken. Was it even tested? config/compiler/intel.hpp first says: #if BOOST_INTEL_CXX_VERSION < 700 # define BOOST_NO_INTRINSIC_WCHAR_T #else ... #endif So if I have intel6, BOOST_NO_INTRINSIC_WCHAR_T is now set. Then config/compiler/intel.hpp goes on to say: #if defined(BOOST_NO_INTRINSIC_WCHAR_T) #include <cwchar> template< typename T > struct assert_no_intrinsic_wchar_t; template<> struct assert_no_intrinsic_wchar_t<wchar_t> { typedef void type; }; // if you see an error here then you need to unset BOOST_NO_INTRINSIC_WCHAR_T: typedef assert_no_intrinsic_wchar_t<unsigned short>::type assert_no_intrinsic_wchar_t_; #else ... #endif So, if I get the error, how exactly am I supposed to "unset BOOST_NO_INTRINSIC_WCHAR_T" before the error occurs? -- Dave Abrahams Boost Consulting http://www.boost-consulting.com