anchor.diff:      (enFlag "upower" (upower != null) null)
       "--disable-hal"
       (enFlag "network-manager" (networkmanager != null) null)
  -    # TODO: libmediaart support
  -    "--disable-libmediaart"
  +    (enFlag "libmediaart" (libmediaart != null) null)
       (enFlag "libexif" (libexif != null) null)
       # TODO: libiptcdata support
       "--disable-libiptcdata"
       (enFlag "exempi" (exempi != null) null)
       "--enable-meegotouch"
  -    "--enable-miner-fs"
  +    "--disable-miner-fs"
       "--enable-extract"
       "--enable-tracker-writeback"
       "--enable-miner-apps"
  
positive.code: , libexif
  , libgee
  , libgsf
  , libjpeg
  , libnotify
  , libpng
  , librsvg
  , libtiff
  
negative.code:     #thunderbird
      upower
      #utillinux
      vala
      zlib
    ];
  
    preConfigure = ''
  