{...}: {
  flake.overlays.rp-pppoe = final: prev: {
    rp-pppoe = final.lib.flip final.callPackage {} ({
      stdenv,
      fetchFromGitHub,
      ppp,
      lib,
    }:
      stdenv.mkDerivation {
        name = "rp-pppoe";
        version = "4.0.0-next";
        src = fetchFromGitHub {
          owner = "dfskoll";
          repo = "rp-pppoe";
          rev = "5748840ac83e7e54fecb1b0034407379c2d6c324";
          hash = "sha256-3QXtVu3IfOoJD60h44cqYGPix/2Gl0IKyFTyDwZIc/0=";
        };
        buildInputs = [ppp];
        sourceRoot = "source/src";
        env.CPATH = lib.concatStringsSep ":" ["${ppp}/include"];
        makeFlags = [
          "DESTDIR=$(out)"
        ];
        configureFlags = [
          "--enable-plugin"
          "--prefix=/"
        ];
        postInstall = ''
          test -f $out/etc/ppp/plugins/rp-pppoe.so
        '';
      });
  };
}