Error(s) in re-building vignettes:
  ...
--- re-building ‘SBC.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.
Creating a 'stanmodel' object beta_binomial
Warning in system(cmd, intern = !verbose) :
  running command '/home/ripley/R/cc/bin/R CMD SHLIB file154165486953.cpp 2> file154165486953.cpp.err.txt' had status 1 and error message 'No child processes'
Quitting from lines 20-45 (SBC.Rmd) 
Quitting from lines 20-45 (SBC.Rmd) 
Error: processing vignette 'SBC.Rmd' failed with diagnostics:
invalid connection
--- failed re-building ‘SBC.Rmd’

--- re-building ‘external.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 200-208 (external.Rmd) 
Quitting from lines 200-208 (external.Rmd) 
Error: processing vignette 'external.Rmd' failed with diagnostics:
invalid connection
--- failed re-building ‘external.Rmd’

--- re-building ‘rstan.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 226-236 (rstan.Rmd) 
Quitting from lines 226-236 (rstan.Rmd) 
Error: processing vignette 'rstan.Rmd' failed with diagnostics:
invalid connection
--- failed re-building ‘rstan.Rmd’

--- re-building ‘stanfit-objects.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 37-46 (stanfit-objects.Rmd) 
Quitting from lines 37-46 (stanfit-objects.Rmd) 
Error: processing vignette 'stanfit-objects.Rmd' failed with diagnostics:
invalid connection
--- failed re-building ‘stanfit-objects.Rmd’

SUMMARY: processing the following files failed:
  ‘SBC.Rmd’ ‘external.Rmd’ ‘rstan.Rmd’ ‘stanfit-objects.Rmd’

Error: Vignette re-building failed.
Execution halted