anchor.diff:      gusb
       lcms2
       libgudev
  -    polkit
       sane-backends
       sqlite
       systemd
  +  ] ++ lib.optionals enableDaemon [
  +    polkit
     ];
   
     postInstall = ''
  
positive.code: , docbook_xml_dtd_412
  , gtk-doc
  , libxslt
  }:
  
  stdenv.mkDerivation rec {
  
negative.code:     "-Dlibcolordcompat=true"
      "-Dsane=true"
      "-Dvapi=true"
      "-Ddaemon=${lib.boolToString enableDaemon}"
      "-Ddaemon_user=colord"
    ];
  
  