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### Running command:
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###   /Library/Frameworks/R.framework/Resources/bin/R CMD build --keep-empty-dirs --no-resave-data rawrr
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* checking for file ‘rawrr/DESCRIPTION’ ... OK
* preparing ‘rawrr’:
* checking DESCRIPTION meta-information ... OK
* installing the package to build vignettes
      -----------------------------------
* installing *source* package ‘rawrr’ ...
** using staged installation
** R
** inst
** byte-compile and prepare package for lazy loading
** help
*** installing help indices
** building package indices
** installing vignettes
** testing if installed package can be loaded from temporary location
Error: package or namespace load failed for ‘rawrr’:
 .onLoad failed in loadNamespace() for 'rawrr', details:
  call: fun(libname, pkgname)
  error: The cross platform, open source .NET framework (mono) is not available.
Consider to install 'apt-get install mono-runtime' on Linux
or download/install from https://www.mono-project.com/.
Error: loading failed
Execution halted
ERROR: loading failed
* removing ‘/private/tmp/RtmpA0iZXS/Rinst1611e43b86ee9/rawrr’
      -----------------------------------
ERROR: package installation failed