Sorry if this looks more like a support request.  There's probably something wrong in my setup (I do have Visual Studio 2015 installed, though).

I am trying to build on Windows using "Tools\buildbot\build.bat -p x64".  It worked a few months ago.  Now I get:

Build FAILED.

       "c:\t\cpython\PCbuild\pcbuild.proj" (Build target) (1) ->
       "c:\t\cpython\PCbuild\pythoncore.vcxproj" (Build target) (2) ->
       (Desktop_PlatformPrepareForBuild target) ->
         C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V140\Platforms\x64\P
       latformToolsets\v140\Toolset.targets(36,5): error MSB8036: The Windows S
       DK version 10.0.16299.0 was not found. Install the required version of W
       indows SDK or change the SDK version in the project property pages or by
        right-clicking the solution and selecting "Retarget solution". [c:\t\cp
       ython\PCbuild\pythoncore.vcxproj]

    0 Warning(s)
    1 Error(s)