anchor.diff:     XML_3.98-1.4.tar.gz \
      BH_1.60.0-2.tar.gz \
      xml2_1.0.0.tar.gz \
  -   curl_2.0.tar.gz \
  +   curl_2.1.tar.gz \
      rversions_1.0.3.tar.gz \
      git2r_0.15.0.tar.gz \
      devtools_1.12.0.tar.gz \
  
positive.code:    http://archive.linux.duke.edu/cran/src/contrib/Rcpp_0.12.7.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/BH_1.60.0-2.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/xml2_1.0.0.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/curl_2.0.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/jsonlite_1.1.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/digest_0.6.10.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/downloader_0.4.tar.gz \
  
negative.code:    Rcpp_0.12.7.tar.gz \
     plyr_1.8.4.tar.gz \
     R6_2.2.0.tar.gz \
     curl_2.1.tar.gz \
     openssl_0.9.4.tar.gz \
     mime_0.5.tar.gz \
     httr_1.2.1.tar.gz \
  