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/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/cli_1.1.0.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/pkgbuild_1.0.2.tar.gz \
  
positive.code:     stringdist_0.9.5.1.tar.gz \
      enc_0.2.0.tar.gz \
      rematch2_2.0.1.tar.gz \
      ps_1.1.0.tar.gz \
      globals_0.12.2.tar.gz \
      iterators_1.0.10.tar.gz \
      listenv_0.7.0.tar.gz \
  
negative.code:    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 \
     processx_3.3.0.tar.gz \
     R6_2.4.0.tar.gz \
     callr_3.2.0.tar.gz \
  