Error(s) in re-building vignettes:
--- re-building ‘det-ex1.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 'det-ex1.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘det-ex1.Rmd’

--- re-building ‘det-ex2.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 'det-ex2.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘det-ex2.Rmd’

--- re-building ‘eigen-ex1.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 'eigen-ex1.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘eigen-ex1.Rmd’

--- re-building ‘eigen-ex2.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 'eigen-ex2.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘eigen-ex2.Rmd’

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

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

--- re-building ‘inv-ex1.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 'inv-ex1.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘inv-ex1.Rmd’

--- re-building ‘inv-ex2.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 'inv-ex2.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘inv-ex2.Rmd’

--- re-building ‘linear-equations.Rmd’ using rmarkdown

Attaching package: 'matlib'

The following object is masked from 'package:rgl':

    GramSchmidt

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

SUMMARY: processing the following files failed:
  ‘det-ex1.Rmd’ ‘det-ex2.Rmd’ ‘eigen-ex1.Rmd’ ‘eigen-ex2.Rmd’
  ‘ginv.Rmd’ ‘gramreg.Rmd’ ‘inv-ex1.Rmd’ ‘inv-ex2.Rmd’
  ‘linear-equations.Rmd’

Error: Vignette re-building failed.
Execution halted