LaTeX Error: Environment pandoccrossrefsubfigures undefined

[andyuex]

I'm trying to render a Markdown document as PDF using pandoc. It includes subfigures and cross-references. When producing the PDF, I get this error message:

! LaTeX Error: Environment pandoccrossrefsubfigures undefined.

Is there any way to avoid this error?

In the meantime, I found a temporary solution that consists on creating a new, known environment to replace the missing one:

\newenvironment{pandoccrossrefsubfigures}
{
  \begin{figure}
}
{
  \end{figure}
}

I hope this is helpful.

I'm using macOS Catalina 10.15.7, pandoc 2.14.1, and pandoc-crossref. I've installed both using homebrew. As a result, pandoc version is 2.14.1, although pandoc-crossref was compiled with pandoc 2.14.0.2. As a result, I get this warning every time I render my documents:

WARNING: pandoc-crossref was compiled with pandoc 2.14.0.2 but is being run through 2.14.1. This is not supported. Strange things may (and likely will) happen silently.

[lierdakil]

Is there any way to avoid this error?

Pretty sure this is explained in the manual under caveats. Tl;dr is pandoc-crossref uses header-includes to inject some LaTeX commands. If your custom pandoc template doesn't use header-includes, it won't work.

Add

$for(header-includes)$
$header-includes$
$endfor$

into the preamble in the template. Or see https://github.com/lierdakil/pandoc-crossref/blob/master/lib-internal/Text/Pandoc/CrossRef/Util/ModifyMeta.hs for what exactly is injected and when and replicate that.

As a result, I get this warning every time I render my documents

That is a homebrew issue, they don't rebuild pandoc-crossref when pandoc updates. I don't use or actually have access to macOS, so I don't know much about homebrew. Someone with a working knowledge of how homebrew triggers rebuilds could probably fix this.

[andyuex]

Thank you for the response. I haven't been able to successfully include:

$for(header-includes)$
$header-includes$
$endfor$

in the template's preamble, but I will keep trying. In the meantime, I will try to replicate what I need from the HS file you provided.

I stumbled upon the link in the manual you include, but I didn't understand it.

Thanks again.

[lierdakil]

Hold on. Sorry, apparently I misread the issue report. Your input format is Markdown? What command are you using to convert to PDF?

[andyuex]

It's something like this:

pandoc \
--standalone \
--metadata-file metadata.yaml \
--filter pandoc-crossref \
--citeproc \
--number-sections \
--include-in-header header.tex \
--output output.pdf \
format.yaml \
input.md

[lierdakil]

Ah. So the issue is --include-in-header, not a custom template. The simplest options are either move header.tex into metadata.yaml (as header-includes), or actually use a custom template based on the default one (see https://pandoc.org/MANUAL.html#templates). Either way, it avoids --include-in-header option.

Or, if you prefer to keep --include-in-header for some reason, make a file latex.template with contents

$for(header-includes)$
$header-includes$
$endfor$

and run

echo | pandoc --metadata-file metadata.yaml -F pandoc-crossref --template latex.template -t latex -s

to dump whatever pandoc-crossref intends to add to the header (this will depend on some settings in metadata.yaml as you might expect). You can add this output to header.tex.

[andyuex]

Thanks so much for the information. For now I will try the second alternative, dumping the directives pandoc-crossref needs into my header.tex. Unfortunately, I'm using more than one --include-in-header directives when rendering the PDF file.