anchor.diff:  
   RUN DEBIAN_FRONTEND=noninteractive R CMD INSTALL \
      jsonlite_0.9.19.tar.gz \
  -   memoise_0.2.1.tar.gz \
  +   memoise_1.0.0.tar.gz \
      whisker_0.3-2.tar.gz \
      RCurl_1.95-4.7.tar.gz \
      Rcpp_0.12.3.tar.gz \
      plyr_1.8.3.tar.gz \
  -   R6_2.1.1.tar.gz \
  -   curl_0.9.4.tar.gz \
  -   httr_1.0.0.tar.gz \
  -   rstudioapi_0.4.0.tar.gz \
  +   R6_2.1.2.tar.gz \
  +   curl_0.9.5.tar.gz \
  +   httr_1.1.0.tar.gz \
  +   rstudioapi_0.45.0.tar.gz \
      brew_1.0-6.tar.gz \
      roxygen2_5.0.1.tar.gz \
      XML_3.98-1.3.tar.gz \
  
positive.code: RUN rm \
     openintro_1.4.tar.gz \
     assertthat_0.1.tar.gz \
     R6_2.1.1.tar.gz \
     magrittr_1.5.tar.gz \
     lazyeval_0.1.10.tar.gz \
     DBI_0.3.1.tar.gz \
  
negative.code:    xml2_0.1.2.tar.gz \
     rversions_1.0.2.tar.gz \
     git2r_0.13.1.tar.gz \
     devtools_1.10.0.tar.gz \
     downloader_0.4.tar.gz
  
  RUN rm \
     jsonlite_0.9.19.tar.gz \
     memoise_1.0.0.tar.gz \
     whisker_0.3-2.tar.gz \
     RCurl_1.95-4.7.tar.gz \
     Rcpp_0.12.3.tar.gz \
     plyr_1.8.3.tar.gz \
     R6_2.1.2.tar.gz \
     httr_1.1.0.tar.gz \
     rstudioapi_0.5.tar.gz \
     brew_1.0-6.tar.gz \
     roxygen2_5.0.1.tar.gz \
     XML_3.98-1.3.tar.gz \
     BH_1.60.0-1.tar.gz \
     xml2_0.1.2.tar.gz \
     curl_0.9.5.tar.gz \
     rversions_1.0.2.tar.gz \
     git2r_0.13.1.tar.gz \
     devtools_1.10.0.tar.gz \
     downloader_0.4.tar.gz
     
  
  