[sr #110497] "This script requires a shell more modern than all the shells I found" message should suggest something

URL:
  <https://savannah.gnu.org/support/?110497>

                 Summary: "This script requires a shell more modern than all
the shells I found" message should suggest something
                 Project: Autoconf
            Submitted by: zackw
            Submitted on: Mon 24 May 2021 01:15:44 PM UTC
                Category: None
                Priority: 5 - Normal
                Severity: 1 - Wish
                  Status: Confirmed
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
        Operating System: Solaris

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Details:

Suggested by Jacob Bachmeyer in
https://lists.gnu.org/archive/html/config-patches/2021-05/msg00016.html : 

> Autoconf should probably mention an old release of bash (that /can/ be built
on a system with a pre-POSIX shell) in the "no better shell" found message.

We'd need to research an appropriate old release of bash (or whatever).  Note
that the systems that don't have _any_ shell where $(...) doesn't work are
even older than the systems where it doesn't work in /bin/sh, and are probably
only of interest for retrocomputing nowadays, so this is low priority.




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