Recently virtualbox-ose-additions-nox11 packages started installing libX11 and other X11 dependencies.
This is due to it not excluding the DBUS option from it's master port. So I'm adding DBUS to OPTIONS_EXCLUDE.
Patch is in phabric:
I'll take it.
A commit references this bug:
Date: Thu Nov 29 21:14:26 UTC 2018
New revision: 486208
Remove X11 dependencies by excluding D-Bus support.