Hacker News Reader

Thanks. What if we want `ruby 2.3.1` not in any nixpkgs channel?

Then you'd have to learn to read Nix expressions. The original expression that builds all ruby versions is here: https://github.com/NixOS/nixpkgs/blob/6120ac5cd201f6cb593d1b... Here's an example that shows how to build a customized version for NodeJS https://www.breakds.org/post/nix-shell-for-nodejs

We had this discussion on twitter, so we probably shouldn't repeat it here :)

I'm not on the nix train but this affects rvm too if a particular version isn't available.

I wish people stopped coming up with hypotheticals and focused on reality: https://news.ycombinator.com/item?id=28603631