{
  description = "A very basic flake";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = inputs: inputs.flake-utils.lib.eachDefaultSystem (system:
    let
      pkgs = inputs.nixpkgs.legacyPackages.${system};
    in
    {
      packages = {
        dropworld = pkgs.callPackage ./dropworld {};
        tcpfilter = pkgs.callPackage ./tcpfilter {};
      };

      devShells.default = pkgs.mkShell {
        buildInputs = with pkgs; [bpftools bpftop];
      };
    }
  );
}