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[sr #110657] Autoconf configure script considers absence of usable grep

From: Paul Eggert
Subject: [sr #110657] Autoconf configure script considers absence of usable grep a fatal error, although it only uses egrep thereafter
Date: Mon, 16 May 2022 01:48:01 -0400 (EDT)

Update of sr #110657 (project autoconf):

                Priority:              5 - Normal => 3 - Low                
                  Status:                    None => Need Info              


Follow-up Comment #1:

> For example, grep does not support -e , but egrep does.
AC_PROG_GREP looks for a grep that does support -e, so a configure script that
uses that should have a $GREP that works, assuming you have one somewhere in
your $PATH. (If not, you'll need to get one.)

> This lack of support of -e makes the configure script fail, although there
is a usable egrep.
Autoconf's 'configure' script doesn't use 'grep -e' anywhere that I can see.
Are you debugging some other 'configure' script that uses 'grep -e'? If so,it
should use AC_PROG_GREP and "$GREP -e" and you should have a grep in your
$PATH that works.


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