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From: Richard Stallman <rms@gnu.org>
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Subject: Re: my Emacs is broken
Date: Mon, 21 Oct 2002 23:13:43 -0400
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    When I set the DISPLAY variable to 0:0 I get the same result as Markus
    and David Koppelman. If the DISPLAY variable is either set to `X-hostname`:0.0
    (that's what I always use) or localhost:0.0 (as long as we're on the X-server),
    than everything's fine. David Koppelman just sent me email that it also
    works for him when the DISPLAY var is set properly.

That does not bring us any closer to finding out what change
caused the problem to appear.  In general, trying different ways
to invoke a failing program is an ineffective approach to debugging.