$ nix-generate-from-cpan Mail::POP3Client
…
===
  MailPOP3Client = buildPerlPackage rec {
    name = "Mail-POP3Client-2.19";
    src = fetchurl {
      url = "mirror://cpan/authors/id/S/SD/SDOWD/${name}.tar.gz";
      sha256 = "1142d6247a93cb86b23ed8835553bb2d227ff8213ee2743e4155bb93f47acb59";
    };
    meta = {
      description = "Perl 5 module to talk to a POP3 (RFC1939) server";
      license = with stdenv.lib.licenses; [ artistic1 gpl1Plus ];
    };
  };