anchor.diff:     httr_1.0.0.tar.gz \
      rstudioapi_0.3.1.tar.gz \
      brew_1.0-6.tar.gz \
  -   roxygen2_4.1.1.tar.gz \
  +   roxygen2_5.0.1.tar.gz \
      XML_3.98-1.3.tar.gz \
      BH_1.58.0-1.tar.gz \
      xml2_0.1.2.tar.gz \
      curl_0.9.3.tar.gz \
      rversions_1.0.2.tar.gz \
      git2r_0.11.0.tar.gz \
  -   devtools_1.8.0.tar.gz \
  +   devtools_1.9.1.tar.gz \
      downloader_0.4.tar.gz
      
   
  
positive.code: RUN DEBIAN_FRONTEND=noninteractive wget \
     http://mirrors.nics.utk.edu/cran/src/contrib/rstudioapi_0.3.1.tar.gz \
     http://mirrors.nics.utk.edu/cran/src/contrib/brew_1.0-6.tar.gz \
     http://mirrors.nics.utk.edu/cran/src/contrib/roxygen2_4.1.1.tar.gz \
     http://mirrors.nics.utk.edu/cran/src/contrib/rversions_1.0.2.tar.gz \
     http://mirrors.nics.utk.edu/cran/src/contrib/git2r_0.11.0.tar.gz \
     http://mirrors.nics.utk.edu/cran/src/contrib/devtools_1.8.0.tar.gz \
     http://mirrors.nics.utk.edu/cran/src/contrib/R6_2.1.1.tar.gz \
     http://mirrors.nics.utk.edu/cran/src/contrib/httr_1.0.0.tar.gz \
     http://mirrors.nics.utk.edu/cran/src/contrib/RCurl_1.95-4.7.tar.gz \
  
negative.code:    http://mirrors.nics.utk.edu/cran/src/contrib/mnormt_1.5-3.tar.gz \
     http://mirrors.nics.utk.edu/cran/src/contrib/psych_1.5.8.tar.gz \
     http://mirrors.nics.utk.edu/cran/src/contrib/broom_0.3.7.tar.gz \
     http://mirrors.nics.utk.edu/cran/src/contrib/reshape_0.8.5.tar.gz \
     http://mirrors.nics.utk.edu/cran/src/contrib/GGally_0.5.0.tar.gz \
     http://mirrors.nics.utk.edu/cran/src/contrib/mosaic_0.12.tar.gz 
  
  RUN DEBIAN_FRONTEND=noninteractive R CMD INSTALL \
  