Thanks to John Darrington for pointing out that this needed to be
done.
* gperf 3.0.1 (or later).
- * Gnulib, from CVS (see http://savannah.gnu.org/cvs/?group=gnulib).
+ * Gnulib, from Git at <git://git.savannah.gnu.org/gnulib.git>.
+ If you do not have Git installed, up-to-date snapshots are
+ at <http://git.savannah.gnu.org/gitweb/?p=gnulib.git>.
Note that Gnulib does not require any form of installation:
simply checking it out into a directory is sufficient. We
recommend checking out gnulib into a directory named `gnulib'