anchor.diff:      reprex_0.2.0.tar.gz \
       tidyverse_1.2.1.tar.gz \
       promises_1.0.1.tar.gz \
  +    globals_0.12.2.tar.gz \
  +    listenv_0.7.0.tar.gz \
       future_1.9.0.tar.gz \
       doMC_1.3.5.tar.gz \
       foreach_1.4.4.tar.gz \
  
positive.code: RUN rm \
      modelr_0.1.2.tar.gz \
      ps_1.1.0.tar.gz \
      processx_3.2.0.tar.gz \
      clipr_0.4.1.tar.gz \
      callr_3.0.0.tar.gz \
  
negative.code:     https://mirrors.nics.utk.edu/cran/src/contrib/callr_3.0.0.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/processx_3.2.0.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/ps_1.1.0.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/globals_0.12.2.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/listenv_0.7.0.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/bench_1.0.1.tar.gz 
  
  RUN DEBIAN_FRONTEND=noninteractive R CMD INSTALL \
  