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From: Eli Zaretskii <eliz@is.elta.co.il>
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Subject: Re: I am running Emacs 21.3.50 on Mac OS 10.2.2. I recently
 installed igrep.el version 2.82, but it is not working properly. ,
 When I am in Dired and type igrep-find or other commands defined in
 igrep.el, I get the following error message:
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On 26 Jan 2003, David wrote:

> I am running Emacs 21.3.50 on Mac OS 10.2.2.

Please report problems with development versions of Emacs to 
emacs-pretest-bug@gnu.org, not here.  Most Emacs developers don't read 
this forum.

> I recently installed
> igrep.el version 2.82, but it is not working properly. When I am in
> Dired and type igrep-find or other commands defined in igrep.el, I get
> the following error message:
> Loading igrep...
> defvar: Symbol's value as variable is void: grep-null-device

Sounds like the Mac port doesn't define grep-null-device.  If so, it's a 
bug that should be fixed.

You could try looking into igrep.el for the definition of 
grep-null-device; I'm guessing that it lacks a test for the Mac.