anchor.diff:  @if /I NOT %buildllvm%==y GOTO build_dxtn
   @echo.
   @cd "%mesa%llvm"
  -@RD /S /Q %abi%
  -@echo.
  -@RD /S /Q cmake-%abi%
  -@echo.
  +@if EXIST %abi% RD /S /Q %abi%
  +@if EXIST cmake-%abi% RD /S /Q cmake-%abi%
   @md cmake-%abi%
   @cd cmake-%abi%
   @set toolchain=Visual Studio 14
  
positive.code: @set vsenvloaded=0
  @set dxtnbuilt=0
  @set toolset=14
  @set /p toolset=<toolset.ini
  @echo.
  @set vsenv=%vsenv14%
  @if %toolset%==15 @set vsenv=%vsenv15%
  
  
negative.code: @set PATH=%gcc%\;%PATH%
  @cd "%mesa%dxtn"
  @echo.
  @if EXIST %abi% RD /S /Q %abi%
  @MD %abi%
  @set dxtn=gcc -shared
  @if %abi%==x86 set dxtn=%dxtn% -m32
  