anchor.diff:     http://archive.linux.duke.edu/cran/src/contrib/bitops_1.0-6.tar.gz
   
   RUN DEBIAN_FRONTEND=noninteractive R CMD INSTALL \
  -   jsonlite_0.9.22.tar.gz \
  +   jsonlite_1.0.tar.gz \
      digest_0.6.10.tar.gz \
      memoise_1.0.0.tar.gz \
      whisker_0.3-2.tar.gz \
  
positive.code:    XML_3.98-1.4.tar.gz \
     BH_1.60.0-2.tar.gz \
     xml2_1.0.0.tar.gz \
     curl_0.9.7.tar.gz \
     rversions_1.0.2.tar.gz \
     git2r_0.15.0.tar.gz \
     devtools_1.12.0.tar.gz \
     downloader_0.4.tar.gz
  
negative.code:    Rcpp_0.12.6.tar.gz \
     plyr_1.8.4.tar.gz \
     R6_2.1.2.tar.gz \
     curl_1.1.tar.gz \
     openssl_0.9.4.tar.gz \
     mime_0.5.tar.gz \
     httr_1.2.1.tar.gz \
     rstudioapi_0.6.tar.gz \
     withr_1.0.2.tar.gz \
     brew_1.0-6.tar.gz \
  