{ stdenv, fetchurl }: stdenv.mkDerivation { name = "szip-2.1"; src = fetchurl { url = ftp://ftp.hdfgroup.org/lib-external/szip/2.1/src/szip-2.1.tar.gz; sha256 = "1vym7r4by02m0yqj10023xyps5b21ryymnxb4nb2gs32arfxj5m8"; }; }