anchor.diff:     formatR_1.5.tar.gz \
      highr_0.6.tar.gz \
      markdown_0.8.tar.gz \
  -   stringi_1.1.6.tar.gz \
  +   stringi_1.1.7.tar.gz \
      magrittr_1.5.tar.gz \
  -   stringr_1.2.0.tar.gz \
  -   knitr_1.18.tar.gz \
  -   yaml_2.1.16.tar.gz \
  -   Rcpp_0.12.15.tar.gz \
  +   stringr_1.3.0.tar.gz \
  +   knitr_1.20.tar.gz \
  +   yaml_2.1.18.tar.gz \
  +   Rcpp_0.12.16.tar.gz \
      htmltools_0.3.6.tar.gz \
      caTools_1.17.1.tar.gz \
      bitops_1.0-6.tar.gz \
  -   digest_0.6.14.tar.gz \
  +   digest_0.6.15.tar.gz \
      mime_0.5.tar.gz
   
   # dependency for R XML library
  
positive.code: 
  RUN DEBIAN_FRONTEND=noninteractive R CMD INSTALL \
     jsonlite_1.5.tar.gz \
     digest_0.6.14.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 \
     plyr_1.8.4.tar.gz \
     R6_2.2.2.tar.gz \
     curl_3.1.tar.gz \
  
negative.code:    git2r_0.21.0.tar.gz \
     devtools_1.13.4.tar.gz \
     brew_1.0-6.tar.gz \
     stringi_1.1.7.tar.gz \
     magrittr_1.5.tar.gz \
     stringr_1.3.0.tar.gz \
     roxygen2_5.0.1.tar.gz \
     XML_3.98-1.9.tar.gz \
     BH_1.65.0-1.tar.gz \
  