[the_why_of_y]

But Gentoo does not meet nine_k's criteria since it supports systemd as an alternative init system.

http://wiki.gentoo.org/wiki/Systemd

[nine_k]

Supporting systemd is fine, requiring it is what I try to avoid.

[the_why_of_y]

Then I don't understand why you want to migrate away from Debian, since there is a resolution from the Debian technical committee that multiple init systems shall be supported.

https://lists.debian.org/debian-devel-announce/2014/08/msg00...