Hi All. tried on VC7.1++ : #include <boost\bind.hpp> #include <boost\mpl\at.hpp> recieve error: boost\boost\mpl\less.hpp(39) : error C2760: syntax error : expected ',' not ';' boost\boost\mpl\less.hpp(51) : see reference to class template instantiation 'boost::mpl::less<T1,T2>' being compiled boost\boost\mpl\less.hpp(39) : error C2144: syntax error : 'const bool' should be preceded by '}' boost\boost\mpl\less.hpp(39) : error C2062: type 'const bool' unexpected boost\boost\mpl\less.hpp(39) : error C2238: unexpected token(s) preceding ';' boost\boost\mpl\less.hpp(42) : error C2065: 'value' : undeclared identifier the less.hpp line 39 is: BOOST_STATIC_CONSTANT(bool, value = msvc71_wknd_); before goes: enum { msvc71_wknd_ = ( BOOST_MPL_AUX_VALUE_WKND(T1)::value < BOOST_MPL_AUX_VALUE_WKND(T2)::value) }; How can I fix it ? --Sincerely Yours,-- --\ SergeY /-- --<>\\\ PisarchiK ///<>-- --<>()<>--Never surrendeR--<>()<>-- mailto:Sergey_pisarchiK@tut.by