anchor.diff:     http://archive.linux.duke.edu/cran/src/contrib/lubridate_1.6.0.tar.gz \
      http://archive.linux.duke.edu/cran/src/contrib/assertthat_0.1.tar.gz \
      http://archive.linux.duke.edu/cran/src/contrib/lazyeval_0.2.0.tar.gz \
  -   http://archive.linux.duke.edu/cran/src/contrib/tibble_1.2.tar.gz \
  +   http://archive.linux.duke.edu/cran/src/contrib/tibble_1.3.0.tar.gz \
      http://archive.linux.duke.edu/cran/src/contrib/ggplot2_2.2.1.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 \
  
positive.code:    magrittr_1.5.tar.gz \
     lazyeval_0.2.0.tar.gz \
     DBI_0.6.tar.gz \
     tibble_1.2.tar.gz \
     dplyr_0.5.0.tar.gz 
  
  RUN DEBIAN_FRONTEND=noninteractive wget \
  
negative.code:    magrittr_1.5.tar.gz \
     lazyeval_0.2.0.tar.gz \
     DBI_0.6.tar.gz \
     tibble_1.3.0.tar.gz \
     dplyr_0.5.0.tar.gz 
  
  RUN rm \
  