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### Running command:
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###   /home/biocbuild/R/R/bin/R CMD build --keep-empty-dirs --no-resave-data topdownr
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* checking for file ‘topdownr/DESCRIPTION’ ... OK
* preparing ‘topdownr’:
* checking DESCRIPTION meta-information ... OK
* installing the package to build vignettes
* creating vignettes ... ERROR
--- re-building ‘analysis.Rmd’ using rmarkdown
Error: processing vignette 'analysis.Rmd' failed with diagnostics:
Pandoc is required to build R Markdown vignettes but not available. Please make sure it is installed.
--- failed re-building ‘analysis.Rmd’

--- re-building ‘data-generation.Rmd’ using rmarkdown
Error: processing vignette 'data-generation.Rmd' failed with diagnostics:
Pandoc is required to build R Markdown vignettes but not available. Please make sure it is installed.
--- failed re-building ‘data-generation.Rmd’

SUMMARY: processing the following files failed:
  ‘analysis.Rmd’ ‘data-generation.Rmd’

Error: Vignette re-building failed.
Execution halted