undefined symbols in the interval library

Using Visual Studio 7.1 and boost_1_33_0, I am getting the following undefined symbol while trying to run an application that uses the interval_lib: error LNK2019: unresolved external symbol _rint referenced in function "public: static double __cdecl boost::numeric::interval_lib::detail::x86_rounding::to_int(double const &)" (?to_int@x86_rounding@detail@interval_lib@numeric@boost@@SANABN@Z) On the other hand, the same code is compiled and runs fine on my powerbook (gcc and the boost same library version). Thanks for help, Matei