{
  description = "common lisp dbus playground";
  inputs.nixpkgs.url = "github:nixos/nixpkgs";
  inputs.flake-utils.url = "github:numtide/flake-utils";

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem
      (system:
        let
          pkgs = nixpkgs.legacyPackages.${system};
          # https://nixos.org/manual/nixpkgs/stable/#lisp-overriding-package-attributes
          # getting version with automatic introspection mixin
          dbus' = pkgs.sbcl.pkgs.dbus.overrideLispAttrs (oldAttrs: rec {
                                                  version = "1.4";
                                                  src = pkgs.fetchFromGitHub {
                                                    owner = "death";
                                                    repo = "dbus";
                                                    rev = "master";
                                                    hash = "sha256-xbg3tPYfRNGJo+9F/58w2bDeZqV33Z871+ClSg4ACPk=";
                                                  };
                                                });
          sbcl' = pkgs.sbcl.withPackages (ps: [ ps.alexandria dbus' ]);
        in
          {
            devShells.default = pkgs.mkShell {
              buildInputs = [
                sbcl'
              ];
            };
          }
      );
  # see https://serokell.io/blog/practical-nix-flakes
}