anchor.diff:  , libX11
   , libv4l
   , qt5
  -, gtk2
  +, gtk3
   , xmlto
   , docbook_xsl
   , autoreconfHook
  
positive.code:     "--with-dbusconfdir=${placeholder "out"}/etc"
    ] else [
      "--without-dbus"
    ]) ++ lib.optionals (!enableVideo) [
      "--disable-video"
      "--without-gtk"
      "--without-qt"
    ];
  
    dontWrapQtApps = true;
  
    postFixup = lib.optionalString enableVideo ''
      wrapQtApp "$out/bin/zbarcam-qt"
    '';
  
  
negative.code:     dbus
    ] ++ lib.optionals enableVideo [
      libv4l
      gtk3
      qt5.qtbase
      qt5.qtx11extras
    ];
  