anchor.diff:     plyr_1.8.4.tar.gz \
      R6_2.1.2.tar.gz \
      mime_0.5.tar.gz \
  -   httr_1.2.0.tar.gz \
  +   httr_1.2.1.tar.gz \
      rstudioapi_0.6.tar.gz \
      openssl_0.9.4.tar.gz \
      withr_1.0.2.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:    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 \
  