Hi, I'm trying to build some of Boost libraries with the very latest VS 2017 Version 15.8.0 Preview 3.0 I've changed project-config.jam to point msvc-14.1 to the corresponding CL.EXE ``` using msvc : 14.1 : "c:\Program Files (x86)\Microsoft Visual Studio\Preview\Professional\VC\Tools\MSVC\14.15.26608\bin\HostX64\x64\cl.EXE" ; ``` In "x64 Native Tools Command Prompt for VS 2017 Preview", I do ``` .\bootstrap.bat b2 -j8 toolset=msvc-14.1 address-model=64 variant=release --with-iostreams ... compile-c-c++ bin.v2\libs\iostreams\build\msvc-14.1\release\address-model-64\link-static\threading-multi\file_descriptor.obj file_descriptor.cpp .\boost/iostreams/positioning.hpp(96): error C2039: 'seekpos': is not a member of 'std::fpos<_Mbstatet>' c:\Program Files (x86)\Microsoft Visual Studio\Preview\Professional\VC\Tools\MSVC\14.15.26608\include\iosfwd(132): note: see declaration of 'std::fpos<_Mbstatet>' ``` Is this expected? Shouldn't this be fixed by https://github.com/boostorg/iostreams/pull/57 ? Or the PR has not made it into the master? Best regards, -- Mateusz Loskot, http://mateusz.loskot.net