Error(s) in re-building vignettes:
--- re-building ‘an_introduction_to_markovchain_package.Rmd’ using rmarkdown
Package:  markovchain
Version:  0.8.4
Date:     2020-03-12
BugReport: http://github.com/spedygiorgio/markovchain/issues

dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'an_introduction_to_markovchain_package.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘an_introduction_to_markovchain_package.Rmd’

--- re-building ‘gsoc_2017_additions.Rmd’ using rmarkdown
Package:  markovchain
Version:  0.8.4
Date:     2020-03-12
BugReport: http://github.com/spedygiorgio/markovchain/issues

dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'gsoc_2017_additions.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘gsoc_2017_additions.Rmd’

--- re-building ‘higher_order_markov_chains.Rmd’ using rmarkdown
Loading required package: markovchain
Package:  markovchain
Version:  0.8.4
Date:     2020-03-12
BugReport: http://github.com/spedygiorgio/markovchain/issues

This function is experimental
dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'higher_order_markov_chains.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘higher_order_markov_chains.Rmd’

SUMMARY: processing the following files failed:
  ‘an_introduction_to_markovchain_package.Rmd’
  ‘gsoc_2017_additions.Rmd’ ‘higher_order_markov_chains.Rmd’

Error: Vignette re-building failed.
Execution halted