anchor.diff:  
   RUN DEBIAN_FRONTEND=noninteractive R CMD INSTALL \
   #    shinystan_2.5.0.tar.gz \
  -    rstanarm_2.17.4.tar.gz \
  +#    rstanarm_2.17.4.tar.gz \
       tidyposterior_0.0.1.tar.gz \
       yardstick_0.0.1.tar.gz \
       tidymodels_0.0.1.tar.gz \
  
positive.code: 
  
  RUN DEBIAN_FRONTEND=noninteractive wget \
      https://mirrors.nics.utk.edu/cran/src/contrib/shinystan_2.5.0.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/rstanarm_2.17.4.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/tidyposterior_0.0.1.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/yardstick_0.0.1.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/tidymodels_0.0.1.tar.gz \
  
negative.code:     greta_0.2.3.tar.gz 
  
  RUN rm \
  #    shinystan_2.5.0.tar.gz \
  #    rstanarm_2.17.4.tar.gz \
      tidyposterior_0.0.1.tar.gz \
      yardstick_0.0.1.tar.gz \
      tidymodels_0.0.1.tar.gz \
  