anchor.diff:  , libvorbis
   , mp4v2
   #, phonon
  -, qt4
  +, python
  +, qt5
   , readline
   , taglib
   , zlib
  
positive.code:     libogg
      libvorbis
      #phonon
      qt4
      readline
      taglib
      zlib
  
negative.code:     (cmFlag "WITH_PHONON" false)
      #WITH_QAUDIODECODER:BOOL=OFF
      #WITH_QML:BOOL=ON
      "-DWITH_QT4=OFF"
      "-DWITH_QT5=ON"
      (cmFlag "WITH_READLINE" (readline != null))
      (cmFlag "WITH_TAGLIB" (taglib != null))
      #WITH_UBUNTUCOMPONENTS:BOOL=OFF
  