Has visualc.hpp been updated to support VC++12? (this was released in Visual Studio 2013 preview). I get the following issue with 1.54.0 beta built with VC++11 when compiling using VC++12: Error 1 error C2039: 'assert_not_arg' : is not a member of 'boost::mpl' (..\..\..\Logging\source\Core.cpp) C:\Users\Charles_J_Wilson\Documents\Projects\external\open_source\boost\1.54.0\boost_1_54_0\boost\iterator\detail\facade_iterator_category.hpp 166 Which is: # if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300) BOOST_MPL_ASSERT_NOT((is_iterator_category<Traversal>)); # endif The beta doesn't recognize the compiler version and suggests running the config tests. Where are the instructions for that? Charles Wilson Principal Software Development Engineer Dell | Enterprise Solutions Group