anchor.diff:  
   # R packages we need for devtools - and we need devtools to be able to update the rmarkdown package
   RUN DEBIAN_FRONTEND=noninteractive wget \
  +   https://archive.linux.duke.edu/cran/src/contrib/callr_3.2.0.tar.gz \
  +   https://archive.linux.duke.edu/cran/src/contrib/cli_1.1.0.tar.gz \
  +   https://archive.linux.duke.edu/cran/src/contrib/pkgbuild_1.0.2.tar.gz \
  +   https://archive.linux.duke.edu/cran/src/contrib/pkgload_1.0.2.tar.gz \
  +   https://archive.linux.duke.edu/cran/src/contrib/rcmdcheck_1.3.2.tar.gz \
  +   https://archive.linux.duke.edu/cran/src/contrib/remotes_2.0.2.tar.gz \
  +   https://archive.linux.duke.edu/cran/src/contrib/sessioninfo_1.1.1.tar.gz \
  +   https://archive.linux.duke.edu/cran/src/contrib/usethis_1.4.0.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/rstudioapi_0.10.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/sys_3.1.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/askpass_1.1.tar.gz \
  
positive.code:     styler_1.0.2.tar.gz \
      lintr_1.0.2.tar.gz \
      testthat_2.0.0.tar.gz \
      pkgbuild_1.0.0.tar.gz \
      pkgload_1.0.0.tar.gz \
      rcmdcheck_1.2.1.tar.gz \
      sessioninfo_1.0.0.tar.gz \
      usethis_1.4.0.tar.gz \
      fs_1.2.6.tar.gz \
      reprex_0.2.0.tar.gz \
      gh_1.0.1.tar.gz \
  
negative.code:    rlang_0.2.2.tar.gz \
     utf8_1.1.4.tar.gz \
     crayon_1.3.4.tar.gz \
     fansi_0.3.0.tar.gz \
     pillar_1.3.0.tar.gz \
     tibble_1.4.2.tar.gz \
  