@isak network probably won't work, Apple uses Broadcom cards that aren't supported on openbsd.
Graphics probably work.
This is arch Linux and is probably as good as it 's gonna get running something other then osx on Apple hardware :
@Qwxlea thanks for the link. Yeah, regarding the hardware that's what I was afraid of. Thanks for the reply. I'll dig around a bit more.
@isak you can use one of those USB-network dongles, some are quite small (and cheap).
As a secure minimal alternative you might look at alpine Linux. Many of the design decisions are modeled in openbsd. Harare support is better, though.
Linux Geeks doing what Linux Geeks do..