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

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

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

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

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

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

SUMMARY: processing the following files failed:
  ‘PTXQC-Basic_Guide_for_R_users.Rmd’ ‘PTXQC-CustomizeReport.Rmd’
  ‘PTXQC-DragNDrop.Rmd’ ‘PTXQC-FAQ.Rmd’
  ‘PTXQC-Input_And_Output_Data.Rmd’ ‘PTXQC-ListOfMetrics.Rmd’

Error: Vignette re-building failed.
Execution halted