See attached build log.
(Please do not complain about the need for looking at the build log until you can provide an easy way to open bugs with the correct data picked out of a tinderbox log. Thanks.)
Created attachment 242621 [details]
Should be fixed with app-emulation/virtualbox-guest-additions-4.0.0
Still not fixed... reopening.
Has this been resolved?
This ticket should have been reassigned a while ago. Done now.
Please reopen if this still affects 5.2.x