{ lib, stdenv, fetchurl, pkg-config, libsigcxx }:

stdenv.mkDerivation rec {
  pname = "libpar2";
  version = "0.4";

  src = fetchurl {
    url = "https://launchpad.net/libpar2/trunk/${version}/+download/${pname}-${version}.tar.gz";
    sha256 = "1m4ncws1h03zq7zyqbaymvjzzbh1d3lc4wb1aksrdf0ync76yv9i";
  };

  nativeBuildInputs = [ pkg-config ];
  buildInputs = [ libsigcxx ];

  patches = [ ./libpar2-0.4-external-verification.patch ];

  CXXFLAGS = lib.optionalString stdenv.cc.isClang "-std=c++11";

  meta = {
    homepage = "https://parchive.sourceforge.net/";
    license = lib.licenses.gpl2Plus;
    description = "A library for using Parchives (parity archive volume sets)";
    platforms = lib.platforms.unix;
  };
}