Have you tried to mount your /boot partition manually as asked? Did you create a separate boot partion when creating the filesystem?
The Gentoo installation handbook says:
Quote:
4.e. Mounting
Now that your partitions are initialized and are housing a filesystem, it is time to mount those partitions. Use the mount command. Don't forget to create the necessary mount directories for every partition you created. As an example we mount the root and boot partition:
Code Listing 15: Mounting partitions
# mount /dev/hda3 /mnt/gentoo
# mkdir /mnt/gentoo/boot
# mount /dev/hda1 /mnt/gentoo/boot
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Of course, the above is only an example, you'd want to use the partitions as you have set them up, rather than doing this exactly, unless your partitions are set up exactly this way as well.
So if you had not done this before (guess you didn't or else you wouldn't get that message), you can still make and mount the /boot directory now. Grub won't install otherwise.
Hope this helps.
