anchor.diff:      # qt
       qtwebkit
       # kde
  -    libkcddb kcmutils kfilemetadata knewstuff knotifyconfig solid kxmlgui
  +    libkcddb karchive kcmutils kfilemetadata knewstuff knotifyconfig solid kxmlgui
       # formats
       flac lame libmad libmpcdec libvorbis
       # sound utilities
  
positive.code: { mkDerivation, lib
  , extra-cmake-modules, kdoctools, makeWrapper
  , qtwebkit
  , libkcddb, kcmutils, kfilemetadata, knewstuff, knotifyconfig, solid, kxmlgui
  , flac, lame, libmad, libmpcdec, libvorbis
  , libsamplerate, libsndfile, taglib
  , cdparanoia, cdrdao, cdrtools, dvdplusrwtools, libburn, libdvdcss, libdvdread, vcdimager
  , ffmpeg, libmusicbrainz2, normalize, sox, transcode
  }:
  
  mkDerivation {
  
negative.code:     # cd/dvd
      cdparanoia libdvdcss libdvdread
      # others
      ffmpeg libmusicbrainz2 shared_mime_info
    ];
    postFixup =
      let k3bPath = lib.makeBinPath [
  