2013/12/17 Scott Kostyshak <skost...@lyx.org>
> As of PS Tricks 2.47a (Nov. 28), some functions are now in the new
> pst-ovl package.
>
> If this patch is not applied and you have an up-to-date TeX Live 2013
> distribution, two of our example files will fail to export:
> examples/fr/exemple-powerdot
> powerdot-example_pdf
>
> Unfortunately, this fix means that if you do not have an up-to-date
> TeX Live 2013 distribution you do not have pst-ovl and the powerdot
> layout will fail for you. Thus, this breaks compilation for older TeX
> distributions.
>
How about
+Preamble
+ \IfFileExists{pst-ovl}{\usepackage{pst-ovl}}{}
+EndPreamble
instead?
Jürgen
