anchor.diff:  
   # GIT - https://git-scm.com/
   # http://tecadmin.net/install-git-2-0-on-centos-rhel-fedora/#
  -ENV GIT_VER 2.19.0
  +ENV GIT_VER 2.19.1
   
   RUN wget https://www.kernel.org/pub/software/scm/git/git-$GIT_VER.tar.gz \
   	&& tar xf git-$GIT_VER.tar.gz && cd git-$GIT_VER \
  
positive.code: 
  # Libreoffice - https://www.libreoffice.org/download/libreoffice-fresh/
  # Linux x64 rpm
  ENV LIBREOFFICE_VER 6.1.2
  ENV LIBREOFFICE_VER_MINOR .1
  
  RUN wget http://mirror.nbtelecom.com.br/tdf/libreoffice/stable/$LIBREOFFICE_VER/rpm/x86_64/LibreOffice_${LIBREOFFICE_VER}_Linux_x86-64_rpm.tar.gz \
  	&& echo "b462407ca869da19c387d4349e51cf7a  LibreOffice_${LIBREOFFICE_VER}_Linux_x86-64_rpm.tar.gz" > LIBREOFFICEMD5 \
  	&& RESULT=$(md5sum -c LIBREOFFICEMD5) \
  	&& echo ${RESULT} > ~/check-libreoffice-md5.txt \
  	&& tar xf LibreOffice_${LIBREOFFICE_VER}_Linux_x86-64_rpm.tar.gz \
  	&& cd LibreOffice_${LIBREOFFICE_VER}${LIBREOFFICE_VER_MINOR}_Linux_x86-64_rpm/RPMS \
  	&& yum -y install *.rpm \
  	&& yum clean all \
  	&& cd && rm -f LIBREOFFICEMD5 && rm -f LibreOffice_${LIBREOFFICE_VER}_Linux_x86-64_rpm.tar.gz \
  	&& rm -rf LibreOffice_${LIBREOFFICE_VER}${LIBREOFFICE_VER_MINOR}_Linux_x86-64_rpm
  
  # Shiny - https://www.rstudio.com/products/shiny/download-server/
  ENV SHINY_VER 1.5.9.923
  
negative.code: RUN source activate py3 && conda install -c conda-forge jupyterlab -y
  
  # Integration between jupyterhub and jupyterlab
  # not working: https://github.com/jupyterhub/jupyterlab-hub/issues/78
  #RUN jupyter labextension install @jupyterlab/hub-extension
  
  # Support for other languages
  # https://github.com/jupyter/jupyter/wiki/Jupyter-kernels
  