anchor.diff:     https://mirrors.nics.utk.edu/cran/src/contrib/devtools_1.13.3.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/R6_2.2.2.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/mime_0.5.tar.gz \
  -   https://mirrors.nics.utk.edu/cran/src/contrib/httr_1.2.1.tar.gz \
  +   https://mirrors.nics.utk.edu/cran/src/contrib/httr_1.3.1.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/RCurl_1.95-4.8.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/Rcpp_0.12.12.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/BH_1.62.0-1.tar.gz \
  
positive.code:    plyr_1.8.4.tar.gz \
     R6_2.2.2.tar.gz \
     mime_0.5.tar.gz \
     httr_1.2.1.tar.gz \
     rstudioapi_0.6.tar.gz \
     openssl_0.9.6.tar.gz \
     withr_2.0.0.tar.gz \
  
negative.code:    curl_2.8.1.tar.gz \
     openssl_0.9.6.tar.gz \
     mime_0.5.tar.gz \
     httr_1.3.1.tar.gz \
     rstudioapi_0.6.tar.gz \
     withr_2.0.0.tar.gz \
     git2r_0.19.0.tar.gz \
  