Current x11-wm/qtile ebuilds do not provide any USE flag.

On my machine, running qtile will log the following warnings:

WARNING safe_import:49 Can't Import Widget: '.launchbar.LaunchBar', No module named xdg.IconTheme
WARNING safe_import:49 Can't Import Widget: '.mpdwidget.Mpd', No module named mpd
WARNING safe_import:49 Can't Import Widget: '.wlan.Wlan', No module named pythonwifi.iwlibs
WARNING safe_import:49 Can't Import Widget: '.google_calendar.GoogleCalendar', No module named httplib2
WARNING safe_import:49 Can't Import Widget: '.imapwidget.ImapWidget', No module named keyring
WARNING setup_python_dbus:261 importing dbus/gobject failed, dbus will not work.

I fixed the setup_python_dbus thing by emerging dev-python/python-dbus and dev-python/pygobject:3

I think it could be good to add ad dbus use flag, if present, add python-dbus and pygobject:3 dependencies. If not present, remove setup_python_dbus() call from qtile source in order to avoid warning (as this is expected behavior).

I also think one should either add xdg, mpd, wifi, httplib2 and maybe other USE flags to toggle required dependencies.

Or either (I think better) add widget-launcher, widget-mpd, widget-google-calendar, ... that would allow to include or no the given widgets (and related dependencies). I think this version is much clearer for the user.

If you are OK, I'd like to fork this package and take the responsibility of its maintainance.