{ stdenv, fetchurl }:

stdenv.mkDerivation rec {
  name = "expat-2.1.0";

  src = fetchurl {
    url = "mirror://sourceforge/expat/${name}.tar.gz";
    sha256 = "11pblz61zyxh68s5pdcbhc30ha1b2vfjd83aiwfg4vc15x3hadw2";
  };

  patches = [ ./CVE-2015-1283.patch ];

  configureFlags = stdenv.lib.optional stdenv.isFreeBSD "--with-pic";

  meta = with stdenv.lib; {
    homepage = http://www.libexpat.org/;
    description = "A stream-oriented XML parser library written in C";
    platforms = platforms.all;
    license = licenses.mit; # expat version
  };
}