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From: "Stephen J. Turnbull" <stephen@xemacs.org>
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Subject: Re: eval-when-compile
Date: Sat, 28 Jul 2012 09:52:38 +0900
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To: Achim Gratz <Stromeko@nexgo.de>
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Achim Gratz writes:

 > What I'm actually trying to do is providing compatibility definitions
 > for other versions of Emacs.

Have you looked at the techniques used in APEL?