anchor.diff:  @set mingw=n
   @set mingwtest=0
   @if EXIST "%gcc%" @set mingwtest=1
  +@if %dxtnbuilt%==0 set PATH=%gcc%\;%PATH%
   @set msys2=%mesa%msys64\msys2_shell.cmd
   @if EXIST "%msys2%" @set mingwtest=%mingwtest%2
   @rem if %mingwtest%==12 @set /p mingw=Do you want to build with MinGW-W64 instead of Visual Studio (y=yes):
   @set buildmingw=
  -@set PATH=%mesa%Python\%abi%\;%mesa%Python\%abi%\Scripts\;%PATH%
  +@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
   @pip install -r requirements.txt --upgrade
  
positive.code: @if NOT EXIST "%vsenv%" @set toolchain=Visual Studio 14
  @if NOT EXIST "%vsenv%" @set vsenv=%VS140COMNTOOLS%..\..\VC\bin\vcvars%minabi%.bat
  @set gcc=%mesa%mingw-w64-%abi%\mingw%minabi%\bin
  @set PATH=%mesa%flexbison\;%mesa%m4\%abi%\bin\;%mesa%cmake\%abi%\bin\;%PATH%
  @if EXIST "%gcc%" set PATH=%gcc%\;%PATH%
  @set vsenvloaded=0
  @set /p buildllvm=Begin LLVM build. Only needs to run once for each ABI and version. Proceed y/n? 
  @if /I NOT %buildllvm%==y GOTO build_dxtn
  
  
negative.code: @echo.
  @%dxtn%
  @echo.
  @set dxtnbuilt=1
  
  :build_mesa
  @set /p buildmesa=Begin mesa build. Proceed (y/n):
  