at least autoconf-2.70 to rebootstrap

[Christoph Grüninger]

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Hi Gary,
in the release notes of libtool 2.4.3 you wrote:

> The libtoolize program now advises use of the new Autoconf 
> AC_CONFIG_MACRO_DIRS declaration. If you follow that advice, all 
> your developers will need at least autoconf-2.70 and automake-1.13
>  to rebootstrap your probject

Do you really require autoconf-2.70? It is not yet released and there
is no plan for a release in the near future, as far as I know.

Best,
Christoph
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