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

  outputs = inputs @ { self, flake-utils, naersk, nixpkgs }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = (import nixpkgs) {
          inherit system;
        };

        naersk' = pkgs.callPackage naersk { };
        mpdlisten = naersk'.buildPackage {
          src = ./.;
        };


      in
      rec {
        # For `nix build` & `nix run`:
        defaultPackage = mpdlisten;

        packages = {
          inherit mpdlisten;
        };
        # For `nix develop`:
        devShell = pkgs.mkShell {
          nativeBuildInputs = with pkgs; [ rustc cargo pkg-config openssl ];
        };

        nixosModules.mpdlisten = import ./nix/mpdlisten.nix;
        nixosModules.default = self.nixosModules.${system}.mpdlisten;
      }
    );
}