{

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    utils.url = "github:numtide/flake-utils";
    naersk = {
      url = "github:nmattia/naersk/master";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { self, nixpkgs, utils, naersk }:
    let
      pkgs = import nixpkgs { system = "x86_64-linux"; overlays = [ naersk.overlay ]; };
      naersk-lib = pkgs.naersk;
    in
    rec {
      overlay = nixpkgs.lib.composeManyExtensions [
        (final: prev: {
          ha-now-playing = naersk-lib.buildPackage
            {
              pname = "ha-now-playing";
              root = ./.;

              buildInputs = [
                prev.openssl
              ];
              nativeBuildInputs = [
                prev.pkg-config
              ];
            };
        })
      ];
    } // utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs { inherit system; overlays = [ self.overlay ]; };
      in
      rec {
        packages.ha-now-playing = pkgs.ha-now-playing;
        defaultPackage = packages.ha-now-playing;

        apps.ha-now-playing = utils.lib.mkApp {
          drv = self.defaultPackage."${system}";
        };
        defaultApp = apps.ha-now-playing;

        devShell = with pkgs; mkShell {
          buildInputs = [ cargo rustc rustfmt pre-commit rustPackages.clippy ];
          RUST_SRC_PATH = rustPlatform.rustLibSrc;
        };

      });

}