Or any other profile for that matter ;-)

A month or so ago we got the question how to enable SELinux on a Gentoo profile that doesn't have a <some profilename>/selinux equivalent. Because we don't create SELinux profiles for all possible profiles out there, having a way to do this yourself is good to know.

Sadly, the most efficient way to deal with this isn't supported by Portage: creating a parent file pointing to /usr/portage/profiles/features/selinux in /etc/portage/profile, as is done for all SELinux enabled profiles. The /etc/portage/profile location (where users can do local changes to the profile settings) does not support a parent file in there.

Luckily, enabling SELinux is a matter of merging the files in /usr/portage/profiles/features/selinux into /etc/portage/profile. If you don't have any files in there, you can blindly copy over the files from features/selinux.

Edit: aballier on #gentoo-dev mentioned that you can create a /etc/portage/make.profile directory (instead of having it be a symlink managed by eselect profile) which does support parent files. In that case, just create one with two entries: one path to the profile you want, and one path to the features/selinux location.