My Gentoo overlay. This is old and messy.
Enable the overlay in Portage:
mkdir -p /etc/portage/repos.conf; curl -o /etc/portage/repos.conf/stintel.conf https://www.linux-ipv6.be/stintel.conf
**DISCLAIMER: I cannot be held responsible for any damage this might cause to either your brain, hardware, relationship, children, pets, ... **