{
  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-22.05";

  outputs = { self, nixpkgs, ... }:
    let
      version = self.lastModifiedDate or "none";
      supportedSystems = [ "x86_64-linux" ];
      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
      nixpkgsFor = forAllSystems (system:
        import nixpkgs {
          inherit system;
          overlays = [ self.overlays.default ];
        });
    in
    {
      overlays.default = final: prev: {
      };

      packages = forAllSystems (system:
        let pkgs = nixpkgsFor.${system}; in
        {
          inherit (pkgs) _;
          default = pkgs._;
        });

      devShells = forAllSystems (system:
        let pkgs = nixpkgsFor.${system}; in
        {
          default = pkgs.mkShell {
            packages = with pkgs; [ ];
          };
        });
    };
}