[sr #110657] Autoconf configure script considers absence of usable grep a fatal error, although it only uses egrep thereafter

Follow-up Comment #4, sr #110657 (project autoconf):

For the record, despite this having been marked "won't do", I _would_ consider
and review a patch (against current development trunk) that would make
configure scripgs set $EGREP and $GREP to `egrep` on systems where `egrep -e`
works but `grep -E -e` doesn't work.  It's just that neither Paul nor I have
the time, nor the necessary test environment, to develop such a patch.


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