Hi. I get the following error when compiling the latest version of boost, using Intel compiler 7.0 in visual c++: ..\..\..\boost\boost/type_traits/is_integral.hpp(39): error: class "boost::is_integral<unsigned short>" has already been defined BOOST_TT_AUX_BOOL_TRAIT_CV_SPEC1(is_integral,wchar_t,true) Now the offending line sits between a "#ifndef BOOST_NO_INTRINSIC_WCHAR_T". The simple fix of defining BOOST_NO_INTRINSIC_WCHAR_T solves this problem, but causes other problems in other locations. All I want is to compile and link against boost::date_time library, using my compiler setup. Thats all. Any suggestions? Greetings, Andre