anchor.diff:  
   RUN DEBIAN_FRONTEND=noninteractive R CMD INSTALL \
      jsonlite_1.5.tar.gz \
  -   digest_0.6.14.tar.gz \
  +   digest_0.6.15.tar.gz \
      memoise_1.1.0.tar.gz \
      whisker_0.3-2.tar.gz \
      bitops_1.0-6.tar.gz \
      RCurl_1.95-4.10.tar.gz \
  -   Rcpp_0.12.15.tar.gz \
  +   Rcpp_0.12.16.tar.gz \
      plyr_1.8.4.tar.gz \
      R6_2.2.2.tar.gz \
      curl_3.1.tar.gz \
  
positive.code:    git2r_0.21.0.tar.gz \
     devtools_1.13.4.tar.gz \
     brew_1.0-6.tar.gz \
     stringi_1.1.6.tar.gz \
     magrittr_1.5.tar.gz \
     stringr_1.2.0.tar.gz \
     roxygen2_5.0.1.tar.gz \
     XML_3.98-1.9.tar.gz \
     BH_1.65.0-1.tar.gz \
  
negative.code:    https://mirrors.nics.utk.edu/cran/src/contrib/openssl_0.9.9.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/withr_2.1.1.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/brew_1.0-6.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/stringi_1.1.7.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/magrittr_1.5.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/stringr_1.3.0.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/Archive/roxygen2/roxygen2_5.0.1.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/rversions_1.0.3.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/git2r_0.21.0.tar.gz \
  