Error(s) in re-building vignettes:
--- re-building ‘WebGL.Rmd’ using rmarkdown
Pandoc is required to build R Markdown vignettes but not available. Please make sure it is installed.
Warning in file.info(x, extra_cols = FALSE) :
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<style type="text/css">
body {
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table {
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th, td { padding: 5px; }
thead, tfoot, tr:nth-child(even) { background: #eee; }
blockquote {
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--- finished re-building ‘WebGL.Rmd’

--- re-building ‘demos.Rmd’ using rmarkdown
Pandoc is required to build R Markdown vignettes but not available. Please make sure it is installed.

Quitting from lines 30-130 [unnamed-chunk-1] (demos.Rmd)
Error: processing vignette 'demos.Rmd' failed with diagnostics:
Saving a widget with selfcontained = TRUE requires pandoc. See here to learn more https://bookdown.org/yihui/rmarkdown-cookbook/install-pandoc.html
--- failed re-building ‘demos.Rmd’

--- re-building ‘deprecation.Rmd’ using rmarkdown
Pandoc is required to build R Markdown vignettes but not available. Please make sure it is installed.
Warning in file.info(x, extra_cols = FALSE) :
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<h1 id="introduction">Introduction</h1>
<p>Since at least 2004, <code>rgl</code> has had two interfaces for many
of the primitive functions:  <code>rgl.*</code> and <code>*3d</code>.  For example,
to draw points you could use <code>rgl.points()</code> or <code>points3d()</code>.
With the upcoming version 1.0.0 release of <code>rgl</code>, most of
the duplication will be removed.  The first step will be
to deprecate a large number of <code>rgl.*</code> functions so they give
warnings when they are called, and a few months later
they will be removed from the package exports.</p>
<p>This document describes the differences and changes needed
by users of the <code>rgl.*</code> interface.</p>
<h1 id="differences-between-the-interfaces">Differences between the interfaces</h1>
<h2 id="opening-a-window">Opening a window</h2>
<p>The <code>rgl.open()</code> function has a single argument, <code>useNULL</code>.
If set to <code>TRUE</code>, the NULL < [... truncated]
--- finished re-building ‘deprecation.Rmd’

--- re-building ‘pkgdown.Rmd’ using rmarkdown
Pandoc is required to build R Markdown vignettes but not available. Please make sure it is installed.
Warning in file.info(x, extra_cols = FALSE) :
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<style type="text/css">
body {
  font-family: sans-serif;
  max-width: 800px;
  margin: auto;
  padding: 1em;
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body, .footnotes, code { font-size: .9em; }
li li { font-size: .95em; }
*, *:before, *:after {
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pre, img { max-width: 100%; }
pre, pre:hover {
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pre code {
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code { font-family: 'DejaVu Sans Mono', 'Droid Sans Mono', 'Lucida Console', Consolas, Monaco, monospace; }
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code.language-undefined, pre > code:not([class]) {
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table {
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table thead th { border-bottom: 1px solid #ddd; }
th, td { padding: 5px; }
thead, tfoot, tr:nth-child(even) { background: #eee; }
blockquote {
  color: #666;
  margin: 0;
  padding-left: 1em; [... truncated]
--- finished re-building ‘pkgdown.Rmd’

--- re-building ‘rgl.Rmd’ using rmarkdown
Pandoc is required to build R Markdown vignettes but not available. Please make sure it is installed.
Warning in file.info(x, extra_cols = FALSE) :
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<style type="text/css">
body {
  font-family: sans-serif;
  max-width: 800px;
  margin: auto;
  padding: 1em;
  line-height: 1.5;
  box-sizing: border-box;
}
body, .footnotes, code { font-size: .9em; }
li li { font-size: .95em; }
*, *:before, *:after {
  box-sizing: inherit;
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pre, img { max-width: 100%; }
pre, pre:hover {
  white-space: pre-wrap;
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}
pre code {
  display: block;
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code { font-family: 'DejaVu Sans Mono', 'Droid Sans Mono', 'Lucida Console', Consolas, Monaco, monospace; }
:not(pre) > code, code[class] { background-color: #F8F8F8; }
code.language-undefined, pre > code:not([class]) {
  background-color: inherit;
  border: 1px solid #eee;
}
table {
  margin: auto;
  border-top: 1px solid #666;
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table thead th { border-bottom: 1px solid #ddd; }
th, td { padding: 5px; }
thead, tfoot, tr:nth-child(even) { background: #eee; }
blockquote {
  color: #666;
  margin: 0;
  padding-left: 1em; [... truncated]
--- finished re-building ‘rgl.Rmd’

--- re-building ‘transparency.Rmd’ using rmarkdown
Pandoc is required to build R Markdown vignettes but not available. Please make sure it is installed.
Warning in file.info(x, extra_cols = FALSE) :
  expanded path length 1663 would be too long for
<style type="text/css">
body {
  font-family: sans-serif;
  max-width: 800px;
  margin: auto;
  padding: 1em;
  line-height: 1.5;
  box-sizing: border-box;
}
body, .footnotes, code { font-size: .9em; }
li li { font-size: .95em; }
*, *:before, *:after {
  box-sizing: inherit;
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pre, img { max-width: 100%; }
pre, pre:hover {
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  word-break: break-all;
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pre code {
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  overflow-x: auto;
}
code { font-family: 'DejaVu Sans Mono', 'Droid Sans Mono', 'Lucida Console', Consolas, Monaco, monospace; }
:not(pre) > code, code[class] { background-color: #F8F8F8; }
code.language-undefined, pre > code:not([class]) {
  background-color: inherit;
  border: 1px solid #eee;
}
table {
  margin: auto;
  border-top: 1px solid #666;
}
table thead th { border-bottom: 1px solid #ddd; }
th, td { padding: 5px; }
thead, tfoot, tr:nth-child(even) { background: #eee; }
blockquote {
  color: #666;
  margin: 0;
  padding-left: 1em; [... truncated]
--- finished re-building ‘transparency.Rmd’

SUMMARY: processing the following file failed:
  ‘demos.Rmd’

Error: Vignette re-building failed.
Execution halted