anchor.diff:  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 1.1.456
  +ENV RSTUDIO_VER 1.1.463
   
   RUN wget https://download2.rstudio.org/rstudio-server-rhel-$RSTUDIO_VER-x86_64.rpm \
  -    && echo "2ecd9dd78d645bd79e2a4ac73da4ff84  rstudio-server-rhel-$RSTUDIO_VER-x86_64.rpm" > RSTUDIOMD5 \
  +    && echo "4d00252fcf7f843fe4fcb00d753133b9  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 \
  
positive.code: ENV CMAKE_ROOT /usr/local/share/cmake-$CMAKE_VER_MAJ
  
  # node https://nodejs.org/en/
  ENV NODE_VER 8.12.0
  
  RUN wget https://github.com/nodejs/node/archive/v$NODE_VER.tar.gz \
      && tar xf v$NODE_VER.tar.gz && cd node-$NODE_VER \
  
negative.code: 
  # llvm needs CMake 2.8.12.2 or higher
  # https://cmake.org/download/
  ENV CMAKE_VER_MAJ 3.13
  ENV CMAKE_VER_MIN .2
  ENV CMAKE_VER $CMAKE_VER_MAJ$CMAKE_VER_MIN
  
  