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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: grep-program and grep-command
Date: Thu, 25 Jan 2007 22:09:33 -0500
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Xref: news.gmane.org gmane.emacs.devel:65471
Archived-At: <http://permalink.gmane.org/gmane.emacs.devel/65471>

    The grep-command is a defcustom, but grep-program is a defvar. 
    grep-command is computed by Emacs if its value is nil.

Let's not mess with this.