anchor.diff:     http://archive.linux.duke.edu/cran/src/contrib/tibble_1.3.3.tar.gz \
      http://archive.linux.duke.edu/cran/src/contrib/bindr_0.1.tar.gz \
      http://archive.linux.duke.edu/cran/src/contrib/bindrcpp_0.2.tar.gz \
  -   http://archive.linux.duke.edu/cran/src/contrib/glue_1.1.0.tar.gz \
  +   http://archive.linux.duke.edu/cran/src/contrib/glue_1.1.1.tar.gz \
      http://archive.linux.duke.edu/cran/src/contrib/pkgconfig_2.0.1.tar.gz \
      http://archive.linux.duke.edu/cran/src/contrib/plogr_0.1-1.tar.gz \
  -   http://archive.linux.duke.edu/cran/src/contrib/dplyr_0.7.0.tar.gz \
  +   http://archive.linux.duke.edu/cran/src/contrib/dplyr_0.7.1.tar.gz \
      http://archive.linux.duke.edu/cran/src/contrib/assertthat_0.2.0.tar.gz \
      http://archive.linux.duke.edu/cran/src/contrib/R6_2.2.2.tar.gz \
      http://archive.linux.duke.edu/cran/src/contrib/magrittr_1.5.tar.gz \
  
positive.code:    tibble_1.3.3.tar.gz \
     bindr_0.1.tar.gz \
     bindrcpp_0.2.tar.gz \
     glue_1.1.0.tar.gz \
     pkgconfig_2.0.1.tar.gz \
     plogr_0.1-1.tar.gz \
     dplyr_0.7.0.tar.gz 
  
  RUN DEBIAN_FRONTEND=noninteractive wget \
     http://archive.linux.duke.edu/cran/src/contrib/chron_2.3-50.tar.gz \
  
negative.code:    lazyeval_0.2.0.tar.gz \
     DBI_0.7.tar.gz \
     tibble_1.3.3.tar.gz \
     glue_1.1.1.tar.gz \
     pkgconfig_2.0.1.tar.gz \
     plogr_0.1-1.tar.gz \
     bindr_0.1.tar.gz \
     bindrcpp_0.2.tar.gz \
     dplyr_0.7.1.tar.gz
  
  RUN rm \
     openintro_1.4.tar.gz \
  