anchor.diff:     R6_2.4.0.tar.gz \
      httr_1.4.0.tar.gz \
      rstudioapi_0.10.tar.gz \
  +   askpass_1.1.tar.gz \
      openssl_1.2.2.tar.gz \
      withr_2.1.2.tar.gz \
      brew_1.0-6.tar.gz \
  
positive.code:    plyr_1.8.4.tar.gz \
     R6_2.4.0.tar.gz \
     curl_3.3.tar.gz \
     openssl_1.2.2.tar.gz \
     httr_1.4.0.tar.gz \
     rstudioapi_0.10.tar.gz \
  
negative.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/rstudioapi_0.10.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/askpass_1.1.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/openssl_1.2.2.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/withr_2.1.2.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/brew_1.0-6.tar.gz \
  