Running ./bootstrap from the 1.4.18 release, and latest master, I get: bootstrap: running: gnulib/gnulib-tool --no-changelog --no-libtool --symlink --update gnulib/gnulib-tool: *** minimum supported autoconf version is 2.63. Try adding AC_PREREQ([2.63]) to your configure.ac. gnulib/gnulib-tool: *** Stop.
According to gnulib's NEWS: 2018-10-22 (all) Automake >= 1.11 and Autoconf >= 2.63 are required. Updating AC_PREREQ in configure.ac from 2.62 to 2.63 fixes. Thanks! Eric Bavier, Scientific Libraries | Cray, a Hewlett Packard Enterprise company
