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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: Tue, 17 May 2022 17:59:31 -0400 (EDT)

Update of sr #110657 (project autoconf):

                  Status:               Need Info => Wont Do                


Follow-up Comment #3:

OK, I think I see what's happening now; you have an egrep that's good enough,
but you also want to test for header files and Autoconf's header-file tests
insist on robust 'grep' because they prefer to use 'grep -E', as egrep was
removed from POSIX a long time ago.

For this sort of thing, I suggest either (a) installing and using a better
'grep' like GNU grep, or (b) running something like './configure
ac_cv_path_GREP=/usr/bin/grep ac_cv_path_egrep=/usr/bin/egrep' in the hopes
that your system grep and egrep are good enough for 'configure'. (a) should be
much better in the long run.

I doubt whether we should modify Autoconf to work around this problem, as it
should occur only on nonstandard platforms that are no longer supported even
by their own suppliers.


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