How can we make F17 be able to boot on Macs (with or without reFit)

[John Reiser]

>   "EFI install from DVD forgets previous EFI boot"
>      https://bugzilla.redhat.com/show_bug.cgi?id=809963#c7
>   "As far as sharing the same /boot/efi directory between installs, we don't
>   support that -- a new copy of the grub.efi binary is written as well as a new
>   grub.conf."
> 

In a related case, anaconda states again that shared, merged grub.conf for EFI
booting is not supported:

   "upgrade using boot.iso destroys EFI boot"
   https://bugzilla.redhat.com/show_bug.cgi?id=816238

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