Error(s) in re-building vignettes:
--- re-building ‘miniCRAN-dependency-graph.rmd’ using rmarkdown
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 'miniCRAN-dependency-graph.rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘miniCRAN-dependency-graph.rmd’

--- re-building ‘miniCRAN-introduction.rmd’ using rmarkdown
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 'miniCRAN-introduction.rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘miniCRAN-introduction.rmd’

--- re-building ‘miniCRAN-non-CRAN-repos.rmd’ using rmarkdown
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 'miniCRAN-non-CRAN-repos.rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘miniCRAN-non-CRAN-repos.rmd’

SUMMARY: processing the following files failed:
  ‘miniCRAN-dependency-graph.rmd’ ‘miniCRAN-introduction.rmd’
  ‘miniCRAN-non-CRAN-repos.rmd’

Error: Vignette re-building failed.
Execution halted