anchor.diff:     stringr_1.2.0.tar.gz \
      knitr_1.17.tar.gz \
      yaml_2.1.14.tar.gz \
  -   Rcpp_0.12.12.tar.gz \
  +   Rcpp_0.12.13.tar.gz \
      htmltools_0.3.6.tar.gz \
      caTools_1.17.1.tar.gz \
      bitops_1.0-6.tar.gz \
  
positive.code:    whisker_0.3-2.tar.gz \
     bitops_1.0-6.tar.gz \
     RCurl_1.95-4.8.tar.gz \
     Rcpp_0.12.12.tar.gz \
     plyr_1.8.4.tar.gz \
     R6_2.2.2.tar.gz \
     curl_2.8.1.tar.gz \
  
negative.code: RUN DEBIAN_FRONTEND=noninteractive wget \
     https://mirrors.nics.utk.edu/cran/src/contrib/knitr_1.17.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/yaml_2.1.14.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/Rcpp_0.12.13.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/htmltools_0.3.6.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/caTools_1.17.1.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/bitops_1.0-6.tar.gz \
  