{ description = "Extremely basic flake"; inputs = { nixpkgs.url = github:nixos/nixpkgs/nixos-23.05; flake-utils.url = github:numtide/flake-utils; }; outputs = { self, nixpkgs, flake-utils}: flake-utils.lib.eachDefaultSystem (system: let pkgs = import nixpkgs { inherit system; }; in { packages = rec { default = throw "put derivation information here"; }; devShells.default = pkgs.mkShell { buildInputs = with pkgs; [ (throw "put packages here") ]; }; }); }