{stdenv, fetchurl, zlib ? null, zlibSupport ? true}: assert zlibSupport -> zlib != null; stdenv.mkDerivation { name = "python-2.3.4"; src = fetchurl { url = http://www.python.org/ftp/python/2.3.4/Python-2.3.4.tar.bz2; md5 = "a2c089faa2726c142419c03472fc4063"; }; buildInputs = [ (if zlibSupport then zlib else null) ]; inherit zlibSupport; }