anchor.diff:  
   COPY requirements.txt /tmp/requirements.txt
   RUN pip install --no-cache-dir -r /tmp/requirements.txt
  +
  +# Support latest RStudio
  +RUN pip install --no-cache 'jupyter-rsession-proxy>=2.0'
   
   # Install IRKernel
   RUN R --quiet -e "install.packages('IRkernel', quiet = TRUE)" && \
  
positive.code:     apt-get clean && \
      rm -rf /var/lib/apt/lists/*
  
  # 1.3.959 is latest version that works with jupyter-rsession-proxy
  # See https://github.com/jupyterhub/jupyter-rsession-proxy/issues/93#issuecomment-725874693
  ENV RSTUDIO_URL https://download2.rstudio.org/server/bionic/amd64/rstudio-server-1.3.959-amd64.deb
  RUN curl --silent --location --fail ${RSTUDIO_URL} > /tmp/rstudio.deb && \
      dpkg -i /tmp/rstudio.deb && \
      rm /tmp/rstudio.deb
  
  COPY install-mambaforge.bash /tmp/install-mambaforge.bash
  RUN /tmp/install-mambaforge.bash
  
  
negative.code: FROM rocker/geospatial:4.1.2
  
  ENV NB_USER rstudio
  ENV NB_UID 1000
  