Regenerating configure

[Shaun Jackman]

I've made some changes to libtool.m4. If I understand correctly,
aclocal-1.4 is used to migrate those changes to aclocal.m4, and
autoconf2.13 is used to migrate the changes from there to configure.
After running aclocal-1.4, the resulting aclocal.m4 file has a
AC_PREREQ(2.50), whereas I believe autoconf2.13 should be used. What's
the magic incantation to generate everything?

I'm using the autoconf2.13 and automake1.4 packages from Debian to
provide the  autoconf2.13 and aclocal-1.4 utilities.

Thanks!
Shaun