Error(s) in re-building vignettes:
--- re-building ‘BGM_Spatial.Rmd’ using rmarkdown
Loading required package: sp

Attaching package: 'dplyr'

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

    intersect, select, union

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

    filter, lag

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

    intersect, setdiff, setequal, union

rgdal: version: 1.4-8, (SVN revision 845)
 Geospatial Data Abstraction Library extensions to R successfully loaded
 Loaded GDAL runtime: GDAL 2.4.2, released 2019/06/28
 Path to GDAL shared files: /Volumes/Builds/packages/high-sierra-x86_64/Rlib/4.0/rgdal/gdal
 GDAL binary built with GEOS: FALSE 
 Loaded PROJ.4 runtime: Rel. 5.2.0, September 15th, 2018, [PJ_VERSION: 520]
 Path to PROJ.4 shared files: /Volumes/Builds/packages/high-sierra-x86_64/Rlib/4.0/rgdal/proj
 Linking to sp version: 1.4-1 
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 'BGM_Spatial.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘BGM_Spatial.Rmd’

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

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

SUMMARY: processing the following files failed:
  ‘BGM_Spatial.Rmd’ ‘BGM_examplefiles.Rmd’ ‘BGMfiles.Rmd’

Error: Vignette re-building failed.
Execution halted