1. Boot up with the Gentoo minimal cd.

2. Mount your gentoo partitions…

mount /dev/sda3 /mnt/gentoo

mount /dev/sda1 /mnt/gentoo/boot

mount -t proc none /mnt/gentoo/proc

mount -o bind /dev /mnt/gentoo/dev

mount --rbind /sys /mnt/gentoo/sys

mount --rbind /dev /mnt/gentoo/dev

3. chroot into the install gentoo environment…

cd /mnt/gentoo

chroot /mnt/gentoo /bin/bash

env-update

source /etc/profile

mount /dev/sda1 /efi

echo 1 > /proc/sys/net/ipv6/conf/all/disable_ipv6