anchor.diff:     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 \
      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 \
  
positive.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/roxygen2_6.0.1.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 \
  
negative.code:    XML_3.98-1.5.tar.gz \
     BH_1.62.0-1.tar.gz \
     xml2_1.1.1.tar.gz \
     desc_1.1.0.tar.gz \
     curl_2.3.tar.gz \
     rversions_1.0.3.tar.gz \
     git2r_0.18.0.tar.gz \
  