anchor.diff:  	SET ENGINE_DOOM64EX=0
   	SET ENGINE_GZDOOM=0
   	SET ENGINE_PRBOOM=0
  -	SET "REQ=%~1"
   )
   REM # zdoom or gzdoom:
   IF /I "%~1" == "zdoom" (
  
positive.code: REM # [/REQ engines]    specify engine requirements,
  REM #                   can be any of the following:
  REM # 
  REM #			no-limit 	- requires a limits-removing engine
  REM #			boom		- requires boom-compatibility; prboom+ and above
  REM #			prboom          - requires prboom+ specifically (either HW or SW); e.g. "Comatose.wad"
  
negative.code: 	SET ENGINE_DOOM64EX=0
  	SET ENGINE_ZANDRONUM=0
  	SET SW=1
  )
  REM # z-based engines; zdoom, gzdoom, zandronum
  IF /I "%~1" == "z" (
  