I've compiled OpenBOR latest dev release to Raspberry, it's the github shot from 01.05.2019
https://github.com/DCurrent/openbor/tree/02375fbcd9c3848045dd7d11819542e83ae46cb1
Download and how to is here
[RetroPie OpenBOR OpenBETA]...
@zanac created some fine patches for OpenBOR engine.
It is time for extended tests
Please follow instructions from here: https://retropie.org.uk/forum/topic/19326/
Thank you so much for OpenBOR