{stdenv, fetchurl, libevent, openssl, zlib}:

stdenv.mkDerivation {
  name = "tor-0.2.1.26";

  src = fetchurl {
    url = "http://www.torproject.org/dist/tor-0.2.1.26.tar.gz";
    sha256 = "18kz1hs6lvckkddy4y36gi7ly03ar2il2xzkrf8bfgif1gnn1p3c";
  };

  patchPhase =
    # DNS lookups fail in chroots.
    '' sed -i "src/or/test.c" -es/localhost/127.0.0.1/g
    '';

  buildInputs = [libevent openssl zlib];

  doCheck = true;

  meta = {
    homepage = http://www.torproject.org/;
    description = "Tor is an onion router enabling Internet anonymity by thwarting network traffic analysis";
    longDescription=''
     Tor protects you by bouncing your communications around a distributed 
     network of relays run by volunteers all around the world: it prevents 
     somebody watching your Internet connection from learning what sites you 
     visit, and it prevents the sites you visit from learning your physical 
     location. Tor works with many of your existing applications, including 
     web browsers, instant messaging clients, remote login, and other 
     applications based on the TCP protocol. 
    '';
    license="bsd";
  };

}