anchor.diff:     wget \
      sudo \
      libcurl4-openssl-dev \
  -   libxml2-dev 
  -
  -# we need TeX for the rmarkdown package in RStudio, and pandoc is also useful 
  -RUN apt-get update 
  -RUN DEBIAN_FRONTEND=noninteractive apt-get  install -y \
  +   libxml2-dev \
      texlive \
      texlive-base \
      texlive-latex-extra \
  
positive.code: RUN add-apt-repository 'deb https://cloud.r-project.org/bin/linux/ubuntu focal-cran40/'
  RUN apt update
  RUN DEBIAN_FRONTEND=noninteractive apt install -y r-base r-base-core r-recommended r-base-dev
  
  
  # we want OpenBLAS for faster linear algebra as described here: http://brettklamer.com/diversions/statistical/faster-blas-in-r/
  RUN apt-get install  -y \
  
negative.code: # expose the RStudio IDE port
  EXPOSE 8787 
  
  CMD ["/usr/bin/supervisord"]