+ * GNU M4 1.4.9 (or later).
+
+ * pkg-config 0.21 (or later).
+
+ * gperf 3.0.1 (or later).
+
+ * 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>.