From mboxrd@z Thu Jan  1 00:00:00 1970
From: Rasmus <rasmus@gmx.us>
Subject: Re: \input causes conflict with LaTeX equation preview
Date: Tue, 21 Oct 2014 00:26:22 +0200
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Ken Mankoff <mankoff@gmail.com> writes:

> I have
>
[+]
> #+LATEX_HEADER: \input{preamble}
>
> in an Org file. When I try to preview equations, it does not work
> because "\input{preamble}" is exported to the equation preview preamble,
> but no file "preamble.tex" is exported. The "preamble.tex" file is not
> needed just to preview an equation.
>
> Can anyone suggest a work-around?

\IfFileExists{./preamble.tex}{true}{false}

Etoolbox has a number of nice tests for more sophisticated
conditioning.

—Rasmus

-- 
Dobbelt-A