anchor.diff:  
   USER ${NB_USER}
   
  -# Install some R libraries that aren't in the base image
  -COPY --chown=rstudio extras.d  /tmp/extras.d
  -# CircleCI stops printing output at 40k chars.
  -# We send stdout to a log file, and tail it a bit
  -# FIXME: Find something less sucky
  -# another hubploy #1
  -RUN chmod -R +x /tmp/extras.d && \
  -	run-parts /tmp/extras.d > /tmp/r-custom-packages.log 2>&1 && \
  -    true || ( echo FAIL ; tail /tmp/r-custom-packages.log ; false )
  -RUN tail /tmp/r-custom-packages.log
  -RUN rm /tmp/r-custom-packages.log
   
   RUN python3 -m venv ${VENV_DIR}
   
  
positive.code:                          jupyter-rsession-proxy==1.0b6 \
                           jupyterhub==1.0.0 \
                           jupyterlab==0.35.6 \
                           notebook==5.7.8
  
  # Install IRKernel
  RUN R --quiet -e "install.packages('IRkernel')" && \
  
negative.code: ENV HOME /home/${NB_USER}
  WORKDIR ${HOME}
  
  # Install packages needed by nbpdfexport
  RUN apt-get update && \
      apt-get install --yes \
              libx11-xcb1 \
              libxtst6 \
              libxrandr2 \
              libasound2 \
              libpangocairo-1.0-0 \
              libatk1.0-0 \
              libatk-bridge2.0-0 \
              libgtk-3-0 \
              libnss3 \
              libxss1 && \
      apt-get clean && \
      rm -rf /var/lib/apt/lists/*
  
  RUN apt-get update && \
      apt-get install --yes \
  