Error producing PDF related to no-prefix-figure-caption

[hborchew]

Greetings,

I am migrating to a new Windows 10 PC and setup/duplicated environment with Pandoc/XNOS/MiKTeX

Here is the error message:
...
Error producing PDF.
! Undefined control sequence.
\fignos:no-prefix-figure-caption ...compatibility
{}{ \let \oldthefigure \th...
l.303 \begin{fignos:no-prefix-figure-caption}
...

Any idea? I have put the required fragment of LaTeX code in include-in-header. The commands were working on prior install.

Here are my versions:
$ pandoc -v
pandoc.exe 2.18
$ pandoc-xnos.exe --version
pandoc-xnos 2.4.0
$ miktex --version
One MiKTeX Utility 1.2 (MiKTeX 22.3)

Any ideas?

Thanks,
Howard

[hborchew]

FYI, I believe I found the root cause for this and a work-around from the caption author.
....
Hallo Howard,

The internal macro \caption@ifcompatibility was dropped in version 3.6 of the caption package. I was not aware that some packages/documents are actually using this internal macro, otherwise I would have replaced it with an emulation of the old behavior instead of dropping it.

I just created an issue, you can track the status here: https://gitlab.com/axelsommerfeldt/caption/-/issues/151

In the meantime you could add the following work-around to your document:

...
\usepackage{caption}
\makeatletter
\providecommand\caption@ifcompatibility{@secondoftwo}
\makeatother
...

HTH,
Axel

On Thu, Jun 23, 2022, at 01:16, Howard Borchew wrote:
Hello Axel,

I am by no measure an expert in LaTeX, but I am getting an error described below.

I have some Tex code as follows from pandoc-fignos

%% pandoc-fignos: required package
\usepackage{cleveref}

%%%% pandoc-fignos: required package
\usepackage{caption}

%% pandoc-fignos: change cref names
\crefname{figure}{Figure}{figs.}

%% pandoc-fignos: environment to disable figure caption prefixes
\makeatletter
\newcounter{figno}
\newenvironment{fignos:no-prefix-figure-caption}{
  \caption@ifcompatibility{}{
    \let\oldthefigure\thefigure
    \let\oldtheHfigure\theHfigure
    \renewcommand{\thefigure}{figno:\thefigno}
    \renewcommand{\theHfigure}{figno:\thefigno}
    \stepcounter{figno}
    \captionsetup{labelformat=empty}
  }
}{
  \caption@ifcompatibility{}{
    \captionsetup{labelformat=default}
    \let\thefigure\oldthefigure
    \let\theHfigure\oldtheHfigure
    \addtocounter{figure}{-1}
  }
}
\makeatother

And I am getting this error:
Error producing PDF.
! Undefined control sequence.
\fignos:no-prefix-figure-caption ...compatibility
{}{ \let \oldthefigure \th...
l.281 \begin{fignos:no-prefix-figure-caption}

I highlighted the offending line above.

This used to work and I think it started failing in a recent update to caption in MiKTeX.

Any advice?

Thanks,
Howard