By "the Gentoo approach", I think pjmlp is referring to the fact that Cargo crates are usually compiled from source for each project, rather than simply distributing binaries. See [the Wikipedia article for Gentoo](https://en.wikipedia.org/wiki/Gentoo_Linux):

> Unlike a binary software distribution, the source code is compiled locally according to the user's preferences and is often optimized for the specific type of computer.