Error(s) in re-building vignettes:
--- re-building ‘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 'Introduction.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘Introduction.Rmd’

--- re-building ‘S4SyntacticSugar.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 'S4SyntacticSugar.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘S4SyntacticSugar.Rmd’

--- re-building ‘aoosClasses.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 'aoosClasses.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘aoosClasses.Rmd’

--- re-building ‘performance.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 'performance.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘performance.Rmd’

--- re-building ‘referenceClasses.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 'referenceClasses.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘referenceClasses.Rmd’

--- re-building ‘retListClasses.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 'retListClasses.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘retListClasses.Rmd’

SUMMARY: processing the following files failed:
  ‘Introduction.Rmd’ ‘S4SyntacticSugar.Rmd’ ‘aoosClasses.Rmd’
  ‘performance.Rmd’ ‘referenceClasses.Rmd’ ‘retListClasses.Rmd’

Error: Vignette re-building failed.
Execution halted