Not sure whether this has any bearing on the errors we are getting. Hopefully someone more knowledgeable than us will respond.
I am building FLAVOUR=debug now. Vijay, Antti -maybe someone else too - do it too if you have spare CPU time. It would be nice if someone who is in OO on OpenBSD could possibly say a word on what logs etc we should provide to help him. I am not asking to fix it. Just tell me how to supply enough info for you to look at the issue in case you will.