It is possible without too much difficulty to get OS X Leopard running as a guest in a virtual machine with Linux as the host without too much difficulty. It is illegal as far as I know unless you have Linux running on real Apple hardware and don’t want to reboot just to use OS X but if you’re in this boat you can also use Virtual Box which officially supports OSX guests on Apple hardware. If you don’t have Apple hardware you’re only option is qemu and now it’s possible with having to manually patch qemu.
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