anchor.diff:  if not exist "%VS100COMNTOOLS%\..\..\vc\vcvarsall.bat" goto vc-set-2008
   call "%VS100COMNTOOLS%\..\..\vc\vcvarsall.bat" %vs_toolset%
   set GYP_MSVS_VERSION=2010
  +echo Using Visual Studio 2010
   goto select-target
   
   :vc-set-2008
  
positive.code: if not exist "%VS110COMNTOOLS%\..\..\vc\vcvarsall.bat" goto vc-set-2010
  call "%VS110COMNTOOLS%\..\..\vc\vcvarsall.bat" %vs_toolset%
  set GYP_MSVS_VERSION=2012
  goto select-target
  
  :vc-set-2010
  
negative.code: if not exist "%VS120COMNTOOLS%\..\..\vc\vcvarsall.bat" goto vc-set-2012
  call "%VS120COMNTOOLS%\..\..\vc\vcvarsall.bat" %vs_toolset%
  set GYP_MSVS_VERSION=2013
  echo Using Visual Studio 2013
  goto select-target
  
  :vc-set-2012
  