Tell your friend to look for the latest information about Wine (is not an emulator π ). Take also a look at this link. It changes a lot, so old threads might be outdated. There is barely any effort to get it work (except disabling software rendering). It works beautifully with hardware acceleration, and Ruby runs better.
I haven't noticed any effort for the Windows/OSX version to share cross-platform technology, that would save time and money and that could ever result in another operating system support.