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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: exec-path not changed in autostart
Date: Fri, 19 Dec 2014 23:46:10 +0200
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> Date: Fri, 19 Dec 2014 13:09:19 -0800 (PST)
> From: Xin Jin <zariskij@gmail.com>
> Injection-Date: Fri, 19 Dec 2014 21:09:20 +0000
> 
> I use the following code to add the paths from the shell environment to exec-path:
> 
> (setq exec-path
>       (append
>        (split-string-and-unquote (getenv "PATH") ":")
>        exec-path))

Why do you need that?  exec-path already includes the directories from
$PATH, so the above sounds redundant.