anchor.diff:     http://archive.linux.duke.edu/cran/src/contrib/mime_0.5.tar.gz \
      http://archive.linux.duke.edu/cran/src/contrib/httr_1.2.1.tar.gz \
      http://archive.linux.duke.edu/cran/src/contrib/RCurl_1.95-4.8.tar.gz \
  -   http://archive.linux.duke.edu/cran/src/contrib/Rcpp_0.12.6.tar.gz \
  +   http://archive.linux.duke.edu/cran/src/contrib/Rcpp_0.12.7.tar.gz \
      http://archive.linux.duke.edu/cran/src/contrib/BH_1.60.0-2.tar.gz \
      http://archive.linux.duke.edu/cran/src/contrib/xml2_1.0.0.tar.gz \
  -   http://archive.linux.duke.edu/cran/src/contrib/curl_1.2.tar.gz \
  -   http://archive.linux.duke.edu/cran/src/contrib/jsonlite_1.0.tar.gz \
  +   http://archive.linux.duke.edu/cran/src/contrib/curl_2.0.tar.gz \
  +   http://archive.linux.duke.edu/cran/src/contrib/jsonlite_1.1.tar.gz \
      http://archive.linux.duke.edu/cran/src/contrib/digest_0.6.10.tar.gz \
      http://archive.linux.duke.edu/cran/src/contrib/downloader_0.4.tar.gz \
      http://archive.linux.duke.edu/cran/src/contrib/memoise_1.0.0.tar.gz \
  
positive.code:    http://archive.linux.duke.edu/cran/src/contrib/bitops_1.0-6.tar.gz
  
  RUN DEBIAN_FRONTEND=noninteractive R CMD INSTALL \
     jsonlite_1.0.tar.gz \
     digest_0.6.10.tar.gz \
     memoise_1.0.0.tar.gz \
     whisker_0.3-2.tar.gz \
     bitops_1.0-6.tar.gz \
     RCurl_1.95-4.8.tar.gz \
     Rcpp_0.12.6.tar.gz \
     plyr_1.8.4.tar.gz \
     R6_2.1.3.tar.gz \
     curl_1.2.tar.gz \
     openssl_0.9.4.tar.gz \
     mime_0.5.tar.gz \
     httr_1.2.1.tar.gz \
  
negative.code: RUN DEBIAN_FRONTEND=noninteractive wget \
     http://archive.linux.duke.edu/cran/src/contrib/knitr_1.14.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/yaml_2.1.13.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/Rcpp_0.12.7.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/htmltools_0.3.5.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/caTools_1.17.1.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/bitops_1.0-6.tar.gz \
  