lxsession/consolekit problem

[Bob Eager]

I've been struggling with this for a few days, so in desperation I'm
asking!

I've installed FreeBSD-11-STABLE. Latest ports tree (as of a few days
ago).

I have installed xorg and LXDE. My .xinitrc contains just:

  exec startlxde

When I use startx, the screen turns graphical, and I get a dialog box
that says:

 GDBus.Error:org.freedesktop.ConsoleKit.Manager.GeneralError: Unable to lookup session information for process '5389'

5389 is lxsession. If I acknowledge the box, LXDE then seems to load
OK, and work. But I'm uneasy.

As far as I can tell, ConsoleKit is looking for an environment variable
called XDG_SESSION_COOKIE - which doesn't appear to be there. Noen of
the documentation seems to help much.

Any ideas, please?
-- 
Bob