anchor.diff:      exiv2
       ffmpeg
       flex
  -    jasper
       lcms2
       lensfun
       libgphoto2
  
positive.code:     marble
      oxygen
      threadweaver
    ];
  
    enableParallelBuilding = true;
  
  
negative.code: , exiv2
  , ffmpeg
  , flex
  , jasper ? null, withJpeg2k ? false  # disable JPEG2000 support, jasper has unfixed CVE
  , lcms2
  , lensfun
  , libgphoto2
  