Error(s) in re-building vignettes:
  ...
--- re-building ‘gallery.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
trying URL 'https://cloud.r-project.org/src/contrib/sass_0.1.2.1.tar.gz'
Content type 'application/x-gzip' length 531225 bytes (518 KB)
==================================================
downloaded 518 KB

* installing *source* package ‘sass’ ...
** package ‘sass’ successfully unpacked and MD5 sums checked
** using staged installation
** libs
MAKEFLAGS= CC="/home/ripley/developerstudio12.6/bin/cc -xc99" CFLAGS="-O -xlibmieee -xlibmil -xtarget=native -xcache=generic -nofstore " CXX="/home/ripley/developerstudio12.6/bin/CC -std=c++11 -library=stdcpp,CrunG3" AR="ar" LDFLAGS="-L/usr/local/lib" make -C libsass
Usage : make [ -f makefile ][ -K statefile ]... [ -d ][ -dd ][ -D ][ -DD ]
             [ -e ][ -i ][ -k ][ -n ][ -p ][ -P ][ -q ][ -r ][ -s ][ -S ][ -t ]
             [ -u ][ -w ][ -V ][ target... ][ macro=value... ][ "macro +=value"... ]
make: Fatal error: Unknown option `-C'
*** Error code 1
make: Fatal error: Command failed for target `libsass/lib/libsass.a'
Current working directory /tmp/RtmpWLay2S/working_dir/Rtmp_HaiVi/R.INSTALL117975907439/sass/src
ERROR: compilation failed for package ‘sass’
* removing ‘/tmp/RtmpWLay2S/RLIBS_59b332d63f26/sass’

The downloaded source packages are in
	'/tmp/RtmpWLay2S/working_dir/RtmpNoaWoi/downloaded_packages'
ERROR: dependency ‘sass’ is not available for package ‘gt’
* removing ‘/tmp/RtmpWLay2S/working_dir/RtmpNoaWoi/gt_folder/gt’
--- finished re-building ‘gallery.Rmd’

--- re-building ‘global_options.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
--- finished re-building ‘global_options.Rmd’

--- re-building ‘tbl_regression.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Quitting from lines 38-52 (tbl_regression.Rmd) 
Error: processing vignette 'tbl_regression.Rmd' failed with diagnostics:
Failed to install 'gt' from GitHub:
  Timeout was reached: [api.github.com] Resolving timed out after 10010 milliseconds
--- failed re-building ‘tbl_regression.Rmd’

--- re-building ‘tbl_summary.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
trying URL 'https://cloud.r-project.org/src/contrib/sass_0.1.2.1.tar.gz'
Content type 'application/x-gzip' length 531225 bytes (518 KB)
==================================================
downloaded 518 KB

* installing *source* package ‘sass’ ...
** package ‘sass’ successfully unpacked and MD5 sums checked
** using staged installation
** libs
MAKEFLAGS= CC="/home/ripley/developerstudio12.6/bin/cc -xc99" CFLAGS="-O -xlibmieee -xlibmil -xtarget=native -xcache=generic -nofstore " CXX="/home/ripley/developerstudio12.6/bin/CC -std=c++11 -library=stdcpp,CrunG3" AR="ar" LDFLAGS="-L/usr/local/lib" make -C libsass
Usage : make [ -f makefile ][ -K statefile ]... [ -d ][ -dd ][ -D ][ -DD ]
             [ -e ][ -i ][ -k ][ -n ][ -p ][ -P ][ -q ][ -r ][ -s ][ -S ][ -t ]
             [ -u ][ -w ][ -V ][ target... ][ macro=value... ][ "macro +=value"... ]
make: Fatal error: Unknown option `-C'
*** Error code 1
make: Fatal error: Command failed for target `libsass/lib/libsass.a'
Current working directory /tmp/RtmpWLay2S/working_dir/RtmpOJaq2j/R.INSTALL13b2408f7b58/sass/src
ERROR: compilation failed for package ‘sass’
* removing ‘/tmp/RtmpWLay2S/RLIBS_59b332d63f26/sass’

The downloaded source packages are in
	'/tmp/RtmpWLay2S/working_dir/Rtmph2aqdj/downloaded_packages'
ERROR: dependency ‘sass’ is not available for package ‘gt’
* removing ‘/tmp/RtmpWLay2S/working_dir/Rtmph2aqdj/gt_folder/gt’
Results will be printed using 'knitr::kable()' and do not 
support footers or spanning headers. 
For tables styled by the gt package, use the installation code below.
'remotes::install_github("rstudio/gt")'

If you prefer to always use 'knitr::kable()', add the option
'options(gtsummary.print_engine = "kable")' to your script
or in a user- or project-level startup file, '.Rprofile'.
--- finished re-building ‘tbl_summary.Rmd’

SUMMARY: processing the following file failed:
  ‘tbl_regression.Rmd’

Error: Vignette re-building failed.
Execution halted