Linux Gentoo is now by default installing GRUB2 instead of GRUB, LILO is considered Legacy, yet still accessible emerge package.
Install of GRUB2 on /dev/sda
grub2-install --grub-setup=/bin/true /dev/sda grub2-mkconfig -o /boot/grub/grub.cfg
Generating grub.cfg ... Found linux image: /boot/kernel-3.2.12-gentoo Found initrd image: /boot/initramfs-genkernel-x86_64-3.2.12-gentoo done
root@bub /boot# grub-mkconfig -o /boot/grub/grub.cfg Generating grub configuration file ... Found linux image: /boot/vmlinuz-<masked>-gentoo Found linux image: /boot/vmlinuz-<masked>-gentoo.old Found linux image: /boot/vmlinuz-<masked>-gentoo Found linux image: /boot/vmlinuz-<masked>-gentoo done