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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: ELisp finding files in Path
Date: Tue, 28 Sep 2010 06:22:02 -0400
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> From: pocmatos@gmail.com (Paulo J. Matos)
> Date: Tue, 28 Sep 2010 11:10:12 +0100
> 
> I would like to execute some commands in my .emacs only if there are
> some files in the current PATH. The specific example is, I only want to
> load a perforce library (p4.el) if I can find the executable p4 in the
> path.
> 
> How can I do this?

Check out the executable-find function, it will return nil if it
doesn't find an executable program on PATH.