{ stdenv, fetchurl }: stdenv.mkDerivation rec { name = "byacc-${version}"; version = "20170709"; src = fetchurl { urls = [ "ftp://ftp.invisible-island.net/byacc/${name}.tgz" "https://invisible-mirror.net/archives/byacc/${name}.tgz" ]; sha256 = "1syrg1nwh2qmlr5mh7c4vz9psdv4gf55h8i5ffw84q6whlcq1kr7"; }; doCheck = true; meta = with stdenv.lib; { description = "Berkeley YACC"; homepage = http://invisible-island.net/byacc/byacc.html; license = licenses.publicDomain; platforms = platforms.unix; }; }