anchor.diff:     gtable_0.2.0.tar.gz \
      RColorBrewer_1.1-2.tar.gz \
      dichromat_2.0-0.tar.gz \
  -   colorspace_1.2-7.tar.gz \
  +   colorspace_1.3-2.tar.gz \
      munsell_0.4.3.tar.gz \
      labeling_0.3.tar.gz \
  -   scales_0.4.0.tar.gz \
  +   scales_0.4.1.tar.gz \
      proto_1.0.0.tar.gz \
      reshape2_1.4.2.tar.gz \
  -   ggplot2_2.1.0.tar.gz \
  +   ggplot2_2.2.0.tar.gz \
      stargazer_5.2.tar.gz \
      minqa_1.2.4.tar.gz \
      nloptr_1.0.4.tar.gz \
  
positive.code:    gtable_0.2.0.tar.gz \
     RColorBrewer_1.1-2.tar.gz \
     dichromat_2.0-0.tar.gz \
     colorspace_1.2-7.tar.gz \
     munsell_0.4.3.tar.gz \
     labeling_0.3.tar.gz \
     scales_0.4.0.tar.gz \
     proto_1.0.0.tar.gz \
     reshape2_1.4.2.tar.gz \
     ggplot2_2.1.0.tar.gz \
     stargazer_5.2.tar.gz \
     minqa_1.2.4.tar.gz \
     nloptr_1.0.4.tar.gz \
  
negative.code: # libraries Eric Green wanted
  RUN DEBIAN_FRONTEND=noninteractive wget \
     http://archive.linux.duke.edu/cran/src/contrib/lubridate_1.6.0.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/ggplot2_2.2.0.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/RColorBrewer_1.1-2.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/dichromat_2.0-0.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/colorspace_1.3-2.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/munsell_0.4.3.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/labeling_0.3.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/scales_0.4.1.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/stargazer_5.2.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/reshape2_1.4.2.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/gtable_0.2.0.tar.gz \
  