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

  pname = "courier-unicode";
  version = "2.2.6";
in {
  flake.overlays.courier-unicode = final: prev: {
    courier-unicode = prev.stdenv.mkDerivation rec {
      inherit pname version;

      src = prev.fetchurl {
        url = "mirror://sourceforge/courier/courier-unicode/${version}/${pname}-${version}.tar.bz2";
        sha256 = "sha256-UT9oBm7RkqzmMPYBmExWW1wdHIHZjGR46+Tts6Fb4Do=";
      };

      nativeBuildInputs = singleton prev.perl;
    };
  };
}