{
  description = "A very basic flake";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
  };

  outputs = { self, nixpkgs, ... }:
  let
    systems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
    forAllSystems = nixpkgs.lib.genAttrs systems;
  in {
    packages = forAllSystems (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
      in {
        hello = pkgs.hello;
        default = pkgs.hello;
      }
    );

    devShells = forAllSystems (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
      in {
        default = pkgs.mkShell {
          packages = with pkgs; [
            erlang_28
            erlang-language-platform
            rebar3
          ];
        };
      }
    );
  };
}