layman -a reagentoo
or
layman -o 'https://github.com/reagentoo/gentoo-overlay/raw/master/repositories.xml' -f -a reagentoo
Add an entry to /etc/portage/repos.conf
:
[reagentoo]
location = /usr/local/portage/reagentoo
sync-uri = https://github.com/reagentoo/gentoo-overlay.git
sync-type = git
auto-sync = yes