anchor.diff:     scales_1.0.0.tar.gz \
      proto_1.0.0.tar.gz \
      reshape2_1.4.3.tar.gz \
  -   lazyeval_0.2.20.2.1.tar.gz \
  +   lazyeval_0.2.2.tar.gz \
      utf8_1.1.4.tar.gz \
  -   fansi_0.4.00.3.0.tar.gz \
  +   fansi_0.4.0.tar.gz \
      pillar_1.3.1.tar.gz \
  -   tibble_1.4.2.tar.gz \
  +   tibble_2.1.1.tar.gz \
      ggplot2_3.1.0.tar.gz \
      stargazer_5.2.2.tar.gz \
      minqa_1.2.4.tar.gz \
  
positive.code: # libraries Eric Green wanted
  RUN DEBIAN_FRONTEND=noninteractive wget \
     https://archive.linux.duke.edu/cran/src/contrib/lubridate_1.7.4.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/lazyeval_0.2.20.2.1.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/utf8_1.1.4.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/fansi_0.4.00.3.0.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/pillar_1.3.1.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/tibble_1.4.2.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/ggplot2_3.1.0.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/RColorBrewer_1.1-2.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/dichromat_2.0-0.tar.gz \
  
negative.code:    scales_1.0.0.tar.gz \
     proto_1.0.0.tar.gz \
     reshape2_1.4.3.tar.gz \
     lazyeval_0.2.2.tar.gz \
     utf8_1.1.4.tar.gz \
     fansi_0.4.0.tar.gz \
     pillar_1.3.1.tar.gz \
     tibble_2.1.1.tar.gz \
     ggplot2_3.1.0.tar.gz \
     stargazer_5.2.2.tar.gz \
     minqa_1.2.4.tar.gz \
  