Outdated libtool creates trouble on macOS

[Torbjörn Granlund]

Marc Glisse <marc.glisse at inria.fr> writes:

  If I run .bootstrap now on shell (freebsd 12.2) after removing
  /home/gmp/usr/bin from my PATH so I get the tools from /usr/local/bin,
  I have a number of errors, but I think that's just because libtool is
  not installed.

It is now.

  Torbjörn, I think we could start generating the GMP tarballs with newer
  autotools at this point (the newer the better, probably).

Yes, let's do that!

I very much appreciate this effort, BTW!

Are the autotools and (just installed) libtool on shell adequate?  They
are the most recent pre-packaged with FreeBSD.

-- 
Torbjörn
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