{ lib, ... }:
let
  inherit (lib)
    singleton;

  pname = "maildrop";
  version = "3.1.5";
in
{
  flake.overlays.maildrop =
    final: prev:
    {
      maildrop = prev.stdenv.mkDerivation {
        inherit pname version;

        src = prev.fetchurl {
          url = "mirror://sourceforge/courier/${pname}/${version}/${pname}-${version}.tar.bz2";
          sha256 = "sha256-Izg/s5uSaQRWRpOXSO5zfnXJ8jmU+MBnI/MEyXp42lo=";
        };

        nativeBuildInputs = with prev; singleton pkg-config;
        buildInputs = with prev; [
          perl
          pcre2.dev
          libidn2.dev
          courier-unicode
        ];

        patches = [
          ./dont-reset-path.patch
          ./maildrop.configure.hack.patch
        ];

        doCheck = false;

        configureFlags = [
          "--enable-maildrop-uid="
          "--enable-maildrop-gid="
        ];

        meta = with lib; {
          homepage = "http://www.courier-mta.org/maildrop/";
          description = "Mail filter/mail delivery agent that is used by the Courier Mail Server";
          license = licenses.gpl3;
          platforms = platforms.linux;
        };
      };
    };
}