Follow-up Comment #1, bug #14990 (project grep):
> I'm using grep 2.5.1-r8 on Gentoo and have perl 5.8.6 for i686
> linux installed.
Add "pcre" to your USE flags in /etc/make.conf.
But indeed the error message could be made a bit clearer, for example:
"Support for the -P option has not been compiled into this binary".
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