gnome-themes-extra: don't manually construct name

{ lib, stdenv, fetchurl, intltool, gtk3, gnome, librsvg, pkg-config, pango, atk, gtk2

, gdk-pixbuf, hicolor-icon-theme }:

let

stdenv.mkDerivation rec {

  pname = "gnome-themes-extra";

  version = "3.28";

in stdenv.mkDerivation rec {

  name = "${pname}-${version}";

  src = fetchurl {

    url = "mirror://gnome/sources/${pname}/${lib.versions.majorMinor version}/${name}.tar.xz";

    url = "mirror://gnome/sources/gnome-themes-extra/${lib.versions.majorMinor version}/gnome-themes-extra-${version}.tar.xz";

    sha256 = "06aqg9asq2vqi9wr29bs4v8z2bf4manhbhfghf4nvw01y2zs0jvw";

  };