[O] \input causes conflict with LaTeX equation preview

[Ken Mankoff]

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?

Thanks,

  -k.