Error(s) in re-building vignettes:
--- re-building ‘stplanr-od.Rmd’ using rmarkdown

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

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

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

--- re-building ‘stplanr-route-nets.Rmd’ using rmarkdown
Linking to GEOS 3.7.2, GDAL 2.4.2, PROJ 5.2.0
2020-04-02 05:36:33 constructing segments
2020-04-02 05:36:33 building geometry
2020-04-02 05:36:33 simplifying geometry
2020-04-02 05:36:33 aggregating flows
2020-04-02 05:36:33 rejoining segments into linestrings
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 'stplanr-route-nets.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘stplanr-route-nets.Rmd’

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

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

SUMMARY: processing the following files failed:
  ‘stplanr-od.Rmd’ ‘stplanr-paper.Rmd’ ‘stplanr-route-nets.Rmd’
  ‘stplanr-routing.Rmd’ ‘stplanr.Rmd’

Error: Vignette re-building failed.
Execution halted