Hello, I use boost_1_33_1 with VC8 on a XP64 Turion system, and get an error message C:/cygwin/usr/include/boost-1_33_1\boost/numeric/interval/hw_rounding.hpp(34) : fatal error C1189: #error : Boost.Numeric.Interval: Please specify rounding control mechanism. What shall I do? Any help would be appreciated. andreas