anchor.diff:     httr_1.2.1.tar.gz \
      rstudioapi_0.6.tar.gz \
      withr_1.0.2.tar.gz \
  +   git2r_0.18.0.tar.gz \
  +   devtools_1.12.0.tar.gz \
      brew_1.0-6.tar.gz \
      stringi_1.1.2.tar.gz \
      magrittr_1.5.tar.gz \
      stringr_1.2.0.tar.gz \
  -   xml2_1.1.1.tar.gz \
  -   desc_1.1.0.tar.gz \
  -   roxygen2_6.0.1.tar.gz \
  +   roxygen2_5.0.1.tar.gz \
      XML_3.98-1.5.tar.gz \
      BH_1.62.0-1.tar.gz \
  +   xml2_1.1.1.tar.gz \
      rversions_1.0.3.tar.gz \
  -   git2r_0.18.0.tar.gz \
  -   devtools_1.12.0.tar.gz \
      downloader_0.4.tar.gz
   
   RUN rm \
  
positive.code:    stringi_1.1.2.tar.gz \
     magrittr_1.5.tar.gz \
     stringr_1.2.0.tar.gz \
     roxygen2_6.0.1.tar.gz \
     BH_1.62.0-1.tar.gz \
     XML_3.98-1.5.tar.gz \
     desc_1.1.0.tar.gz \
     xml2_1.1.1.tar.gz \
     curl_2.3.tar.gz \
     rversions_1.0.3.tar.gz \
     git2r_0.18.0.tar.gz \
     devtools_1.12.0.tar.gz \
     downloader_0.4.tar.gz
     
  
  # libraries Eric Green wanted
  
negative.code:    http://archive.linux.duke.edu/cran/src/contrib/stringi_1.1.2.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/magrittr_1.5.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/stringr_1.2.0.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/Archive/roxygen2/roxygen2_5.0.1.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/rversions_1.0.3.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/git2r_0.18.0.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/devtools_1.12.0.tar.gz \
  