anchor.diff:     https://archive.linux.duke.edu/cran/src/contrib/downloader_0.4.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/memoise_1.1.0.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/plyr_1.8.4.tar.gz \
  -   https://archive.linux.duke.edu/cran/src/contrib/XML_3.98-1.19.tar.gz \
  +   https://archive.linux.duke.edu/cran/src/contrib/XML_3.98-1.20.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/whisker_0.3-2.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/bitops_1.0-6.tar.gz
   
   RUN DEBIAN_FRONTEND=noninteractive R CMD INSTALL \
      ps_1.3.0.tar.gz \
      R6_2.4.0.tar.gz \
  -   processx_3.3.0.tar.gz \
  +   processx_3.3.1.tar.gz \
      callr_3.2.0.tar.gz \
      crayon_1.3.4.tar.gz \
      assertthat_0.2.1.tar.gz \
      cli_1.1.0.tar.gz \
  -   backports_1.1.3.tar.gz \
  +   backports_1.1.4.tar.gz \
      rprojroot_1.3-2.tar.gz \
      desc_1.2.0.tar.gz \
      prettyunits_1.0.2.tar.gz \
      withr_2.1.2.tar.gz \
      pkgbuild_1.0.3.tar.gz \
  -   rlang_0.3.3.tar.gz \
  +   rlang_0.3.4.tar.gz \
      rstudioapi_0.10.tar.gz \
      pkgload_1.0.2.tar.gz \
      xopen_1.0.0.tar.gz \
      sessioninfo_1.1.1.tar.gz \
  -   rcmdcheck_1.3.2.tar.gz \
  -   remotes_2.0.2.tar.gz \   
  +   rcmdcheck_1.3.3.tar.gz \
  +   remotes_2.0.4.tar.gz \   
      whisker_0.3-2.tar.gz \
      git2r_0.25.2.tar.gz \
  -   fs_1.2.7.tar.gz \
  +   fs_1.3.1.tar.gz \
      ini_0.3.1.tar.gz \
      jsonlite_1.6.tar.gz \
  -   sys_3.1.tar.gz \
  +   sys_3.2.tar.gz \
      askpass_1.1.tar.gz \
  -   openssl_1.3.tar.gz \
  +   openssl_1.4.tar.gz \
      curl_3.3.tar.gz \
      httr_1.4.0.tar.gz \
      gh_1.0.1.tar.gz \
  -   clipr_0.5.0.tar.gz \
  +   clipr_0.6.0.tar.gz \
      clisymbols_1.2.0.tar.gz \   
  -   usethis_1.4.0.tar.gz \
  +   usethis_1.5.0.tar.gz \
      memoise_1.1.0.tar.gz \
      bitops_1.0-6.tar.gz \
      RCurl_1.95-4.12.tar.gz \
      plyr_1.8.4.tar.gz \
  -   devtools_2.0.1.tar.gz \
  +   devtools_2.0.2.tar.gz \
      brew_1.0-6.tar.gz \
      roxygen2_5.0.1.tar.gz \
  -   XML_3.98-1.19.tar.gz \
  +   XML_3.98-1.20.tar.gz \
      BH_1.69.0-1.tar.gz \
      xml2_1.2.0.tar.gz \
  -   rversions_1.0.3.tar.gz \
  +   rversions_2.0.0.tar.gz \
      downloader_0.4.tar.gz
   
   RUN rm \
      ps_1.3.0.tar.gz \
      callr_3.2.0.tar.gz \
      R6_2.4.0.tar.gz \
  -   processx_3.3.0.tar.gz \
  +   processx_3.3.1.tar.gz \
      crayon_1.3.4.tar.gz \
      assertthat_0.2.1.tar.gz \
      cli_1.1.0.tar.gz \
      desc_1.2.0.tar.gz \
      prettyunits_1.0.2.tar.gz \
  -   backports_1.1.3.tar.gz \
  +   backports_1.1.4.tar.gz \
      rprojroot_1.3-2.tar.gz \
      withr_2.1.2.tar.gz \
      pkgbuild_1.0.3.tar.gz \
  -   rlang_0.3.3.tar.gz \
  +   rlang_0.3.4.tar.gz \
      rstudioapi_0.10.tar.gz \
  -   clipr_0.5.0.tar.gz \
  +   clipr_0.6.0.tar.gz \
      clisymbols_1.2.0.tar.gz \
      pkgload_1.0.2.tar.gz \
      sessioninfo_1.1.1.tar.gz \
      xopen_1.0.0.tar.gz \
  -   rcmdcheck_1.3.2.tar.gz \
  -   remotes_2.0.2.tar.gz \
  -   usethis_1.4.0.tar.gz \
  +   rcmdcheck_1.3.3.tar.gz \
  +   remotes_2.0.4.tar.gz \
  +   usethis_1.5.0.tar.gz \
      ini_0.3.1.tar.gz \
      jsonlite_1.6.tar.gz \
      memoise_1.1.0.tar.gz \
  
positive.code: 
  # 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/processx_3.3.0.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/ps_1.3.0.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/callr_3.2.0.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/crayon_1.3.4.tar.gz \
  
negative.code:    https://archive.linux.duke.edu/cran/src/contrib/cli_1.1.0.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/desc_1.2.0.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/prettyunits_1.0.2.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/backports_1.1.4.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/rprojroot_1.3-2.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/withr_2.1.2.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/pkgbuild_1.0.3.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/rlang_0.3.4.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/rstudioapi_0.10.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_1.3.3.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/remotes_2.0.4.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/xopen_1.0.0.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/clipr_0.6.0.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/clisymbols_1.2.0.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_1.5.0.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/sys_3.2.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/askpass_1.1.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/openssl_1.4.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/brew_1.0-6.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/Archive/roxygen2/roxygen2_5.0.1.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/fs_1.3.1.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/gh_1.0.1.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/rversions_2.0.0.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/git2r_0.25.2.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/devtools_2.0.2.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/R6_2.4.0.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/httr_1.4.0.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/RCurl_1.95-4.12.tar.gz \
  