Hi, In past years, we have been used boost 1.34.0 in our projects, and it works fine. Now days, we want to update the boost to 1.39.0, but when we change the include directories and lib path to use boost 1.39.0, the following compile error occured: 1>d:\reference\boost\v1_39_0\boost\type_traits\type_with_alignment.hpp(138) : error C2061: syntax error : identifier 'BOOST_PP_LIST_FOLD_RIGHT_BOOST_PP_IIF_BOOST_PP_BITAND_1BOOST_PP_LIST_FOLD_LEFT_CHECK_BOOST_PP_IIF_BOOST_PP_CHECK' 1> d:\reference\boost\v1_39_0\boost\type_traits\type_with_alignment.hpp(143) : see reference to class template instantiation 'boost::detail::lower_alignment<target>' being compiled 1>d:\reference\boost\v1_39_0\boost\type_traits\type_with_alignment.hpp(138) : error C2059: syntax error : ')' 1>d:\reference\boost\v1_39_0\boost\type_traits\type_with_alignment.hpp(138) : error C2143: syntax error : missing ')' before '(' 1>d:\reference\boost\v1_39_0\boost\type_traits\type_with_alignment.hpp(138) : error C2061: syntax error : identifier 'BOOST_PP_LIST_FOR_EACH_I_M' ... I have tried several ways to resovlve it, but all failed. Does anyone know how to fix this issue or any advice? I really appreciate your help. Best Regards, wind.