kx does not work in default OSX X11 environment

[Harald Barth <haba@kth.se>]

When started, as default MacOSX display is

DISPLAY=/tmp/launch-xxxxx/:0

(xxx some random text)

However in the XAUTHORITY generated from the same MaxOSX I can only
find keys for hosts called:

hostname/unix:0
hostname:0
localhost:0

I think this is the reason kx as distributed in the installer package
(heimdal 1.1 and heimdal 1.2) can not open any X11 window on the local
machine.

If I set:

DISPLAY=:0

it works. So why sets the MacOSX the DISPLAY variable in such a
strange way, why do other MacOSX programs not bother an why does kx
not work as the other MaxOSX programs?

How should this be fixed? Where should this be fixed?

Harald.