{ 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"; }; meta = { description = " Szip is a compression library that can be used with the hdf5 library. "; homepage = http://www.hdfgroup.org/doc_resource/SZIP/; license = stdenv.lib.licenses.unfree; }; }