gksu and dbus connect

[patrick013]

Searching doesn't provide an answer.

When I run gksu syncbackup or gksu qtconfig I get an error message :
GConf-WARNING **: Client failed to connect to the D-BUS daemon:

Other programs like Synaptic and GParted and gksu work fine. Might
be QT related as the Juffed text editor doesn't pick up QT settings.

This is on Stretch with OpenBox. I usually have to hunt down a library or 2 with
OpenBox but this one is still hiding. Any help appreciated.