{
  description = "birdtown-visit-counter";

  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
  inputs.flake-utils.url = "github:numtide/flake-utils";
  inputs.gomod2nix.url = "github:nix-community/gomod2nix";
  inputs.gomod2nix.inputs.nixpkgs.follows = "nixpkgs";
  inputs.gomod2nix.inputs.flake-utils.follows = "flake-utils";

  outputs = inputs@{ self, nixpkgs, flake-utils, gomod2nix }:
    (flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
        callPackage =
          pkgs.darwin.apple_sdk_11_0.callPackage or pkgs.callPackage;
      in {
        packages.default = callPackage ./. {
          inherit (gomod2nix.legacyPackages.${system}) buildGoApplication;
        };
        devShells.default = callPackage ./shell.nix {
          inherit (gomod2nix.legacyPackages.${system}) mkGoEnv gomod2nix;
        };
      })) // {
        nixosModules.default = import ./module.nix inputs;
      };
}