anchor.diff:  
   
   :build_with_vs
  -@RD /S /Q build\windows-%longabi%
  -@echo.
  +@if EXIST build\windows-%longabi% RD /S /Q build\windows-%longabi%
   @set PATH=%mesa%Python\%abi%\;%mesa%Python\%abi%\Scripts\;%mesa%flexbison\;%mesa%m4\%abi%\usr\bin\;%PATH%
   @pip install -U mako
   @pip freeze > requirements.txt
  
positive.code: @if /I NOT %buildllvm%==y GOTO build_dxtn
  @echo.
  @cd "%mesa%llvm"
  @RD /S /Q %abi%
  @echo.
  @RD /S /Q cmake-%abi%
  @echo.
  @md cmake-%abi%
  @cd cmake-%abi%
  @set toolchain=Visual Studio 14
  
negative.code: @set vsenvloaded=0
  @set dxtnbuilt=0
  @set toolset=14
  @if EXIST toolset.ini set /p toolset=<toolset.ini
  @set vsenv=%vsenv14%
  @if %toolset%==15 @set vsenv=%vsenv15%
  
  