Commit f5d8e1c77d2ed40ee734eb0c5627f425c595f33f breaks CentOS 6 (again)

[ellie timoney]

Yep, it's due to the use of the 'm4_esyscmd_s' macro.  I've seen a few
other projects achieve 2.63 compatibility just by detecting whether this
macro is available, and providing their own replacement if not.  I plan
to do something like this too, hopefully before next release, but
haven't yet looked into it deeply.  Would welcome a patch in the
meantime!

On Thu, Aug 4, 2016, at 10:26 PM, Sebastian Hagedorn wrote:
> Hi Ellie,
> 
> your commit f5d8e1c77d2ed40ee734eb0c5627f425c595f33f requires Autoconf 
> version 2.68 or higher, but CentOS 6 only has Autoconf 2.63 by default. 
> There is a separate RPM for Autoconf 2.68, and after I installed that it 
> works from within the git repository if I use "autoreconf268 -vi"
> manually.
> 
> I would also note that the dependencies here list Autoconf 2.63:
> 
> <http://cyrusimap.org/imap/installation/diy.html>
> 
> I have a related, but separate issue, for which I will write another
> mail.
> 
> Cheers
> Sebastian
> -- 
>     .:.Sebastian Hagedorn - Weyertal 121 (Gebäude 133), Zimmer 2.02.:.
>                  .:.Regionales Rechenzentrum (RRZK).:.
>    .:.Universität zu Köln / Cologne University - ✆ +49-221-470-89578.:.
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