{
  description = "learning Common Lisp";

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem
      (system:
        let pkgs = nixpkgs.legacyPackages.${system}; in
        {
          devShells.default = pkgs.mkShell {
            buildInputs = [ pkgs.sbcl pkgs.inotify-tools ];
          };
        }
      );
  # see https://serokell.io/blog/practical-nix-flakes

}