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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: /lib/cpp not found in c-mode
Date: Wed, 04 May 2005 18:05:11 -0400
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    > As long as that is the case, it should not be terribly hard to specify
    > that info for the whole directory, and thus make c-macro-expand work.

    Could be, although I don't know of any mechanism to do that right now.

I could imagine putting a special file in the directory, or a hint
specifically for Emacs in Makefile in the directory.