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According to Ilay Bobir on 4/4/2009 5:57 PM:
> Hi,
> 
> Starting with version 2.4 GNU grep supports specification of default
> option values via GREP_OPTIONS environment variable.  Many if not all of
> the configure files generated by the autoconf use grep.  For example,
> configure file for libtool uses grep.

Thanks for the report.  I agree that unsetting GREP_OPTIONS as part of
AC_PROG_GREP (and friends) sounds reasonable, so I will add this to my
todo list (I ran out of time to write the patch today, but wanted you to
at least know your email did not hit a black hole).

- --
Don't work too hard, make some time for fun as well!

Eric Blake             [email protected]
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