anchor.diff:  
   # Anaconda
   # https://repo.continuum.io/archive
  -ENV CONDA_VER 5.3.1
  +ENV CONDA_VER 2019.03
   
   ENV PATH $PATH:/usr/local/conda/anaconda3/bin
   
  
positive.code: 
  # llvm needs CMake 2.8.12.2 or higher
  # https://cmake.org/download/
  ENV CMAKE_VER_MAJ 3.13
  ENV CMAKE_VER_MIN .4
  ENV CMAKE_VER $CMAKE_VER_MAJ$CMAKE_VER_MIN
  
  RUN wget https://cmake.org/files/v$CMAKE_VER_MAJ/cmake-$CMAKE_VER.tar.gz \
  
negative.code: RUN echo 'options(repos = c(CRAN="https://ftp.osuosl.org/pub/cran/"))' >> /usr/lib64/R/library/base/R/Rprofile
  
  # RStudio - https://www.rstudio.com/products/rstudio/download-server/
  ENV RSTUDIO_VER 1.2.1335
  
  RUN wget https://download2.rstudio.org/server/centos6/x86_64/rstudio-server-rhel-$RSTUDIO_VER-x86_64.rpm \
      && echo "da696c9823eb1c044f04adf75f722b64  rstudio-server-rhel-$RSTUDIO_VER-x86_64.rpm" > RSTUDIOMD5 \
      && RESULT=$(md5sum -c RSTUDIOMD5) \
      && echo ${RESULT} > ~/check-rstudio-md5.txt \
      && yum -y install --nogpgcheck rstudio-server-rhel-$RSTUDIO_VER-x86_64.rpm \
  