[O] Per-backend export options?

[tomas]

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Hi,

it must be in the fine manual. But after wandering there without a good
idea on how to find that...

What I'm trying to do is to suppress footnotes in Beamer export, and
keep them in PDF export.

Suppressing the footnotes is easy enough:

  #+OPTIONS: f:nil [... possibly other options ...]

Can I do that in a way that the value depends on backend? I.e. f:nil
for beamer and f:t for latex/pdf?

Thanks for any hints
- -- t
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