Hi, I have successfully build Boost, but when I want to "make" a program which uses Boost library, I get an error that points to one of Boost files. boost/mpl/aux_/numeric_op.hpp:250: error: expected unqualified-id before ‘:’ token Part of the code is: #if !defined(BOOST_MPL_CFG_MSVC_ETI_BUG)     : AUX778076_OP_IMPL_NAME<           typename AUX778076_OP_TAG_NAME<N1>::type         , typename AUX778076_OP_TAG_NAME<N2>::type         >::template apply::type #else .... It is strange for me because, the libboost are created so why get another error in boost now?  // Naderan *Mahmood;