Elfen said:

Years ago (around '05 or so) I remember the PPC BSD Unix branch getting a Nubus Mac to boot its Unix along with the Mac GUI - Evolution (I believe it is), and boot a few PPC OSX Mac applications. OSX is based on BSD, so this is possible then, and it is now. But interest in it fall so the project was set to some side burner to stay warm and forgotten about. I have not heard from this every since '06.

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Wait, missed this part. By any chance are you thinking of COMPAT_DARWIN? If so, well...

A: That never progressed to the point it would run Quartz. It could run some relatively trivial command line and X11 software, but that's not "OS X" as most people think of it.

B: Running OS X binaries on NetBSD through an API translation layer isn't running OS X, nor is NetBSD "the same" OS as OS X. OS X *does* steal a fair amount of NetBSD userland code (although these days it steals a little more from FreeBSD) but the binary format, driver model, and kernel internals are completely different.

C: PowerPC NetBSD doesn't run on Nubus Macs anyway. (Neither does Open or FreeBSD.)

The one *possible* strategy I can imagine for attempting to run OS X on a NuBus Power Mac using existing code would be to install an old version of Linux with Nubus support (Not MkLinux, real Linux) and maybe, just *maybe*, installing Mac-On-Linux on top of that? (I'm not sure that's technically possible; MOL may have some dependencies on PCI bus/Open Firmware in how it sets up its virtual machine, but... yeah, no idea. Last time I ran MOL was in 2002.) If someone has the hardware to try it it might be a really fun way to waste a weekend.