id summary reporter owner description type status milestone component version severity resolution keywords cc 13083 msvc c++14 permissive- unrecognizable template declaration Gunnar "MS has come out with /permissive- (read more: https://blogs.msdn.microsoft.com/vcblog/2016/11/16/permissive-switch/) This resulted in these errors: 1>C:\Dev\Couloir\3pLibs\Boost\boost_1_64_0\boost/typeof/msvc/typeof_impl.hpp(125): error C2988: unrecognizable template declaration/definition (compiling source file Wt\WGLWidget.C) 1>C:\Dev\Couloir\3pLibs\Boost\boost_1_64_0\boost/typeof/msvc/typeof_impl.hpp(133): note: see reference to class template instantiation 'boost::type_of::msvc_extract_type' being compiled (compiling source file Wt\WGLWidget.C) 1>C:\Dev\Couloir\3pLibs\Boost\boost_1_64_0\boost/typeof/msvc/typeof_impl.hpp(125): error C2143: syntax error: missing ';' before '<' (compiling source file Wt\WGLWidget.C) 1>C:\Dev\Couloir\3pLibs\Boost\boost_1_64_0\boost/typeof/msvc/typeof_impl.hpp(125): error C2913: explicit specialization; 'boost::type_of::id2type_impl' is not a specialization of a class template (compiling source file Wt\WGLWidget.C) 1>C:\Dev\Couloir\3pLibs\Boost\boost_1_64_0\boost/typeof/msvc/typeof_impl.hpp(125): error C2059: syntax error: '<' (compiling source file Wt\WGLWidget.C) 1>C:\Dev\Couloir\3pLibs\Boost\boost_1_64_0\boost/typeof/msvc/typeof_impl.hpp(126): error C2334: unexpected token(s) preceding '{'; skipping apparent function body (compiling source file Wt\WGLWidget.C) I searched and found this: https://svn.boost.org/trac10/ticket/4593 So, I defined _MSC_EXTENSIONS But I got the same errors. Any help would be greatly appreciated. " Bugs new To Be Determined Building Boost Boost 1.64.0 Problem