{
  description = "small utilities";

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

  outputs =
    { nixpkgs, ... }:
    let
      inherit (nixpkgs.lib) genAttrs;
      systems = [
        "x86_64-linux"
        "x86_64-darwin"
        "aarch64-linux"
        "aarch64-darwin"
      ];
      forAllSystems = f: genAttrs systems (system: f (import nixpkgs { inherit system; }));
    in
    {
      packages = forAllSystems (pkgs: rec {
        utils = pkgs.callPackage ./meta.nix { inherit tunnel; };
        tunnel = pkgs.callPackage ./tunnel-go { };
        default = utils;
      });
      devShells = forAllSystems (pkgs: {
        default = pkgs.mkShell {
          packages = with pkgs; [
            go
            nim
          ];
        };
      });
      formatter = forAllSystems (pkgs: pkgs.nixfmt-rfc-style);
    };
}