anchor.diff:  if not exist "%VS140COMNTOOLS%\..\..\vc\vcvarsall.bat" goto vc-set-2013
   call "%VS140COMNTOOLS%\..\..\vc\vcvarsall.bat" %vs_toolset%
   set GYP_MSVS_VERSION=2015
  +echo Using Visual Studio 2015
   goto select-target
   
   :vc-set-2013
  
positive.code: if not exist "%VS90COMNTOOLS%\..\..\vc\vcvarsall.bat" goto vc-set-notfound
  call "%VS90COMNTOOLS%\..\..\vc\vcvarsall.bat" %vs_toolset%
  set GYP_MSVS_VERSION=2008
  goto select-target
  
  :vc-set-notfound
  
negative.code: if not exist "%VS110COMNTOOLS%\..\..\vc\vcvarsall.bat" goto vc-set-2010
  call "%VS110COMNTOOLS%\..\..\vc\vcvarsall.bat" %vs_toolset%
  set GYP_MSVS_VERSION=2012
  echo Using Visual Studio 2012
  goto select-target
  
  :vc-set-2010
  