$ ./auto_gen.sh
---------------
running libtool
---------------
---------------
running aclocal
---------------
aclocal (GNU automake) 1.10
Written by Tom Tromey <tromey@redhat.com>
and Alexandre Duret-Lutz <adl@gnu.org>.
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
------------------
running autoheader
------------------
aclocal.m4:14: error: this file was generated for autoconf 2.60.
You have another version of autoconf. If you want to use that,
you should regenerate the build system entirely.
aclocal.m4:14: the top level
autom4te-2.61: /usr/bin/m4 failed with exit status: 63
autoheader-2.61: '/usr/bin/autom4te-2.61' failed with exit status: 63