Error(s) in re-building vignettes:
  ...
--- re-building ‘overview.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
--- finished re-building ‘overview.Rmd’

--- re-building ‘performance.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
--- finished re-building ‘performance.Rmd’

--- re-building ‘troubleshooting.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
--- finished re-building ‘troubleshooting.Rmd’

--- re-building ‘tutorial-animations.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Loading required package: sp
Loading required package: viridisLite
Quitting from lines 27-62 (tutorial-animations.Rmd) 
Error: processing vignette 'tutorial-animations.Rmd' failed with diagnostics:
there is no package called 'gifski'
--- failed re-building ‘tutorial-animations.Rmd’

--- re-building ‘tutorial-basic.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Loading required package: sp
Loading required package: viridisLite
--- finished re-building ‘tutorial-basic.Rmd’

--- re-building ‘tutorial-ggplot.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Loading required package: sp
Loading required package: viridisLite
--- finished re-building ‘tutorial-ggplot.Rmd’

--- re-building ‘tutorial-temporal.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Loading required package: sp
Loading required package: viridisLite
--- finished re-building ‘tutorial-temporal.Rmd’

SUMMARY: processing the following file failed:
  ‘tutorial-animations.Rmd’

Error: Vignette re-building failed.
Execution halted