os-prober not detecting Arch install

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http://unix.stackexchange.com – I'm triple booting osx, win 7 and arch on an apple macbook pro 8,2 I've followed the guide specific for my macbook pro here: Macbook Pro 8,2 Arch Installation As well as the beginners install guide here: Arch Beginners Guide Everything has gone well and I can boot and login fine. However I've come to a problem whilst trying to configure grub2. I've run this and I've verified that its worked correctly # modprobe dm-mod # grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=arch_grub --boot-directory=/boot/efi/EFI --recheck --debug # mkdir -p /boot/efi/EFI/grub/local (HowTos)