Manual adding with layman:
layman -o 'https://raw.github.com/seamus-45/seamustuff/master/seamustuff.xml' -f -k -a seamustuff
Custom Gentoo Overlay
layman -o 'https://raw.github.com/seamus-45/seamustuff/master/seamustuff.xml' -f -k -a seamustuff
Custom Gentoo Overlay