[annnnd]

TL;DR: use VMware player.

Yes, I ran several versions of Hackintosh VDI files on VirtualBox under Linux. It all works, but it is slooooooow (on some seriously fast hardware too). I tried many versions because of that, and used both OSS and Oracle versions of VirtualBox, but nothing helped. I finally gave up and tried using VMware player. What a difference... It runs smoothly, things "just work". I didn't have the courage to enable network connection to the world though - I have no idea what else is installed on the (pirated) OSX. But if you install it yourself (from a legal copy) you should be ok.

[jlgaddis]

That sounds like more trouble than I want to deal with. If it were as effortless as running Windows in a VM I might pursue it but I don't have enough of a real need for it to bother. Thanks!