anchor.diff:  	SET ENGINE_PRBOOM=0
   	SET ENGINE_ZANDRONUM=0
   	SET "VER_GZDOOM=gzdoom-31"
  -	SET "REQ=%~1"
   )
   REM # hardware-renderers only:
   IF /I "%~1" == "hw" (
   	REM # disable all non-hardware renderers
   	SET ENGINE_CHOCODOOM=0
   	SET SW=0
  -	SET "REQ=%~1"
   )
   REM # software-renderers only:
   IF /I "%~1" == "sw" (
  
positive.code: 	SET ENGINE_DOOM64EX=0
  	SET ENGINE_GZDOOM=0
  	SET ENGINE_PRBOOM=0
  	SET "REQ=%~1"
  )
  REM # zandronum v3 only:
  IF /I "%~1" == "zandronum-3" (
  
negative.code: 	SET ENGINE_DOOM64EX=0
  	SET ENGINE_PRBOOM=0
  	SET ENGINE_ZANDRONUM=0
  )
  SET "REQ=%~1"
  GOTO:EOF
  
  :complevel
  