It's an overlay for Gentoo. I mean, some recipes of how to build some applications or libraries using a Linux distro called Gentoo.
Mostly C++ related recipes.
First, get a machine with Gentoo. Then:
emerge eselect-repository
(optional) eselect repository add ex_repo git https://github.com/Arniiiii/ex_repo.git
eselect repository enable ex_repo
emaint sync -r ex_repo
dev-util/cmake-format: removed because unmaintained andneocmakelspworks better.kleidiaiandllama-cppsince I do not use them and were somewhat unmaintained.