anchor.diff:      core = "mednafen-lynx";
       src = getCoreSrc "beetle-lynx";
       description = "Port of Mednafen's Lynx core to libretro";
  -    license = gpl2;
  +    license = lib.licenses.gpl2Only;
       makefile = "Makefile";
     };
   
  
positive.code:     core = "mednafen-supergrafx";
      src = getCoreSrc "beetle-supergrafx";
      description = "Port of Mednafen's SuperGrafx core to libretro";
      license = gpl2;
      makefile = "Makefile";
    };
  
  
negative.code:     core = "mednafen-ngp";
      src = getCoreSrc "beetle-ngp";
      description = "Port of Mednafen's NeoGeo Pocket core to libretro";
      license = lib.licenses.gpl2Only;
      makefile = "Makefile";
    };
  
  