{ pkgs ? import <nixpkgs> {} }:
  pkgs.mkShell {
    # nativeBuildInputs is usually what you want -- tools you need to run
    nativeBuildInputs =
      let erlpkgs = pkgs.buildPackages.beam.packages.erlangR24;
      in [
        erlpkgs.elixir
        erlpkgs.hex
        erlpkgs.rebar3
        pkgs.libsodium
      ];
  }