Windows "blender2.8" branch build failure

C:\blender-git\blender>make full verbose
svn   : C:\cygwin64\bin\svn.exe
cmake : C:\Program Files\CMake\bin\cmake.exe
git   : C:\Program Files\Git\cmd\git.exe
No explicit msvc version requested, autodetecting version.
Detecting msvc 2017
Visual Studio 2017 (15.2 or newer) is not detected
Detecting msvc 2015
Visual Studio 2015 not found.
Compiler Detection failed. Use verbose switch for more information.
Visual Studio not found (try with the 'verbose' switch for more information)