{stdenv, fetchurl}: derivation
  { name = "gnutar-1.13.25"
  , system = stdenv.system
  , builder = ./builder.sh
  , src = fetchurl
      { url = ftp://alpha.gnu.org/gnu/tar/tar-1.13.25.tar.gz
      , md5 = "6ef8c906e81eee441f8335652670ac4a"
      }
  , stdenv = stdenv
  }