core/pkgs/by-name/ng/ngtcp2/packages.nix

{ ... }:
res: pkgs: super:

with pkgs; {
  ngtcp2 = callPackage ./ngtcp2 {
    inherit (darwin.apple_sdk.frameworks) CoreServices;
  };
  ngtcp2-gnutls = callPackage ./gnutls.nix { };
}