Autoconf 2.59 yells about it for some reason.
# 02111-1307, USA.
# We want a recent Autotest.
-m4_version_prereq([2.57])
+m4_version_prereq([2.58])
## ------------------------------- ##
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.
-# Initializes Autotest, imports macros etc. It will trigger a warning
-# with Autoconf 2.58, because it includes this file automatically, but
-# it causes no real problem.
-m4_include([local.at])
-
# Testing resistance to user bugs.
m4_include([input.at])