anchor.diff:  # Metadata
   ########################################################################
   
  -ENV NBGALLERY_CLIENT_VERSION=6.0.0
  +ENV NBGALLERY_CLIENT_VERSION=6.0.1
   
   LABEL gallery.nb.version=$NBGALLERY_CLIENT_VERSION \
         gallery.nb.description="Minimal alpine-based Jupyter notebook server" \
  
positive.code:     python-dev && \
    pip install --no-cache-dir --upgrade setuptools pip && \
    mkdir -p `python -m site --user-site` && \
    min-pip jupyter ipywidgets jupyter_dashboards pypki2 && \
    echo "# temporarily install branch with fix (TODO)" && \
    pip install --no-cache-dir http://github.com/nbgallery/ipydeps/tarball/initialize_master_working_set#egg=ipydeps && \
    jupyter nbextension enable --py --sys-prefix widgetsnbextension && \
    pip install http://github.com/nbgallery/nbgallery-extensions/tarball/master#egg=jupyter_nbgallery && \
    jupyter serverextension enable --py jupyter_nbgallery && \
  
negative.code:     python3 \
      python3-dev && \
    pip3 install --no-cache-dir --upgrade setuptools pip && \
    min-pip3 entrypoints ipykernel ipywidgets pypki2 ipydeps && \
    echo "### Make sure python2 is still default" && \
    sed -i -r -e 's/python3(\.\d)?/python2/g' \
      /usr/bin/jupyter* \
  