{ stdenv, fetchurl, pkg-config, flex, bison }:

let
  pname = "ptlib";
  version = "2.18.6";
  hash = "sha256-31HndbsCS73uU0yvJW7/YA7s56+9V2itafuLPqllE2Y=";

in stdenv.mkDerivation {
  inherit pname version;

  src = fetchurl {
    url =
      "mirror://sourceforge/project/opalvoip/v3.18%20Cygni/Stable%206/ptlib-${version}.tar.bz2";
    inherit hash;
  };

  #patches = [
  #  ./ptlib-pidfile.patch
  #];

  buildInputs = [ pkg-config ];
  nativeBuildInputs = [ flex bison ];

  #NIX_CFLAGS_COMPILE = [ "-fpermissive" ];
  #CXXFLAGS = "-std=gnu++98";
}