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From: Glenn Morris <rgm@gnu.org>
Newsgroups: gmane.emacs.bugs
Subject: Re: Making it possible to use INFOPATH with Emacs info files
Date: Fri, 02 May 2008 03:08:26 -0400
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To: Reuben Thomas <rrt@sc3d.org>
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Reuben Thomas wrote:

>   This variable `Info-default-directory-list' is used as the default
>   for initializing `Info-directory-list' when Info is started, unless
>   the environment variable INFOPATH is set.
>
> which means that if I set INFOPATH, then I don't get access to Emacs's own 
> info files (under /usr/share/info/emacs-22) unless I manually add this path 
> to Info-directory-list.

The doc of Info-directory-list says that if INFOPATH ends in a colon,
INFOPATH is combined with Info-default-directory-list. Works for me.