Undefined control sequence. \pdfoverlaySetPDF{...} about pdfoverlay HOT 7 CLOSED

This happens because for some reason \sys_if_output_pdf:TF is not defined in the preamble.

For now, you can set the PDF after \begin{document}:

\documentclass{article}
\usepackage{pdfoverlay}
\begin{document}
\pdfoverlaySetPDF{capitolo1.pdf}
Annotation on page 1.
\pdfoverlayIncludeToPage{10}
Annotation on page 10.
\pdfoverlayIncludeToLastPage
\end{document}

I will follow up with the LaTeX3 team and find out what is going on.

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@xAlien95 , which TeX engine are you using?

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Oh, I see! I'm sure it didn't used to do that!

from pdfoverlay.

[...] which TeX engine are you using?

It's pdflatex:

PDFLATEX: pdflatex -version
pdfTeX 3.14159265-2.6-1.40.21 (TeX Live 2020)
kpathsea version 6.3.2

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Thank you.

From my point of view, this solves the issue. Feel free to close this issue if you prefer.

from pdfoverlay.

@xAlien95 Apparently the output format can be changed in the preamble, so this macro is defined late.

Another workaround is to explicitly load expl3 before loading pdfoverlay.

I will fix this issue, but am not yet quite sure what the best option is.

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I've sent a new release to CTAN, so it should be available on the mirrors in a couple of days.

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