anchor.diff:      globals_0.12.2.tar.gz \
       iterators_1.0.10.tar.gz \
       listenv_0.7.0.tar.gz \
  -    processx_3.2.0.tar.gz \
       clipr_0.4.1.tar.gz \
       tidyverse_1.2.1.tar.gz \
       promises_1.0.1.tar.gz \
  
positive.code:    https://archive.linux.duke.edu/cran/src/contrib/bitops_1.0-6.tar.gz
  
  RUN DEBIAN_FRONTEND=noninteractive R CMD INSTALL \
     callr_3.2.0.tar.gz \
     cli_1.1.0.tar.gz \
     pkgbuild_1.0.2.tar.gz \
  
negative.code:     https://archive.linux.duke.edu/cran/src/contrib/microbenchmark_1.4-4.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/modelr_0.1.2.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/clipr_0.4.1.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/ps_1.1.0.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/globals_0.12.2.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/listenv_0.7.0.tar.gz \
  