{
  description = "GoDaddy DDNS — update A records via REST";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
      in {
        packages.default = pkgs.rustPlatform.buildRustPackage {
          pname = "godaddy_ddns";
          version = "0.1.0";
          src = ./.;
          cargoLock.lockFile = ./Cargo.lock;

          nativeBuildInputs = [ pkgs.pkg-config ];
          buildInputs = [ pkgs.openssl ]
            ++ pkgs.lib.optionals pkgs.stdenv.isDarwin [
              pkgs.darwin.apple_sdk.frameworks.Security
              pkgs.darwin.apple_sdk.frameworks.SystemConfiguration
            ];

          doCheck = false;
        };

        devShells.default = pkgs.mkShell {
          packages = [
            pkgs.cargo
            pkgs.rustc
            pkgs.rustfmt
            pkgs.clippy
            pkgs.pkg-config
            pkgs.openssl
          ];
        };
      });
}