enable perl regexp

[dx k9]

Hi,

What's the syntax to enable perl regexp when building grep?

I just tried

./configure --prefix=/usr/local/grep-2.5.3 --enable-perl-regexp and that didn't 
work

or is it enable feature perl or enable package??

Not seeing anything regarding this in the INSTALL or README .

By default (SLES 9) grep has this
feature(supports the -P).  So, I was expecting by building with the
defaults it would have
been enabled.

Thanks,
~DjK
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