When I try to build vignettes for a package under Windows the package shared
library is built twice, first presumably to generate the vignette, and then
to
generate the package binary. But the library building steps are of course
the same.

Is this a known issue or is there a way to get it to build the library only
once?

If I have already processed the vignettes and use the --no-vignettes option
then
there is no problem, it builds the library once and uses the PDF files that
are there.

Thanks for any pointers.

Dominick

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