anchor.diff:      https://mirrors.nics.utk.edu/cran/src/contrib/greta_0.2.3.tar.gz 
   
   RUN DEBIAN_FRONTEND=noninteractive R CMD INSTALL \
  -    htmlwidgets_1.2.tar.gz \
       nycflights13_1.0.0.tar.gz \
       abynames_0.3.0.tar.gz \
       janeaustenr_0.1.5.tar.gz \
  
positive.code: 
  RUN DEBIAN_FRONTEND=noninteractive wget \
      https://mirrors.nics.utk.edu/cran/src/contrib/pryr_0.1.4.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/profvis_0.3.5.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/RcppArmadillo_0.9.100.5.0.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/xaringan_0.7.tar.gz \
  
negative.code: 
  RUN DEBIAN_FRONTEND=noninteractive R CMD INSTALL \
      pryr_0.1.4.tar.gz \
      htmlwidgets_1.2.tar.gz \
      profvis_0.3.5.tar.gz \
      RcppArmadillo_0.9.100.5.0.tar.gz \
      xaringan_0.7.tar.gz \
  