I am unable to build nektar 4.4.1 on MS Windows 10 using Visual Studio 14 win64. The error comes from Loki: Loki::ClassLevelLockable The actual error messages are reproduced below: ======================================================================== "C:\CFD\nektar\build\INSTALL.vcxproj" (default target) (1) -> "C:\CFD\nektar\build\ALL_BUILD.vcxproj" (default target) (3) -> "C:\CFD\nektar\build\solvers\ADRSolver\ADRSolver.vcxproj" (default target) (4) -> "C:\CFD\nektar\build\library\SolverUtils\SolverUtils.vcxproj" (default target) (17) -> (ClCompile target) -> C:\CFD\nektar\nektar441\library\SolverUtils\EquationSystem.cpp(88): error C2039: 'ClassLevelLocka ble': is not a member of 'Loki' [C:\CFD\nektar\build\library\SolverUtils\SolverUtils.vcxproj] C:\CFD\nektar\nektar441\library\SolverUtils\EquationSystem.cpp(88): error C2065: 'ClassLevelLocka ble': undeclared identifier [C:\CFD\nektar\build\library\SolverUtils\SolverUtils.vcxproj] ======================================================================== BOOST_HOME is c:\local\boost_1_61_0 (along with the modifications suggested in the user guide for version 4.4.1) Please let me know if any additional information is required. Thank you for your help. Madhu Rao