anchor.diff:  
   
   RUN DEBIAN_FRONTEND=noninteractive wget \
  -    https://mirrors.nics.utk.edu/cran/src/contrib/pROC_1.12.1.tar.gz \
  -    https://mirrors.nics.utk.edu/cran/src/contrib/gtools_3.8.1.tar.gz \
  -    https://mirrors.nics.utk.edu/cran/src/contrib/gdata_2.18.0.tar.gz \
  -    https://mirrors.nics.utk.edu/cran/src/contrib/gplots_3.0.1.tar.gz \
  -    https://mirrors.nics.utk.edu/cran/src/contrib/MLmetrics_1.1.1.tar.gz \
  -    https://mirrors.nics.utk.edu/cran/src/contrib/yardstick_0.0.1.tar.gz \
  -    https://mirrors.nics.utk.edu/cran/src/contrib/xgboost_0.71.2.tar.gz \
  -    https://mirrors.nics.utk.edu/cran/src/contrib/ModelMetrics_1.2.0.tar.gz \
  -    https://mirrors.nics.utk.edu/cran/src/contrib/caret_6.0-80.tar.gz \
  -    https://mirrors.nics.utk.edu/cran/src/contrib/e1071_1.7-0.tar.gz \
  -    https://mirrors.nics.utk.edu/cran/src/contrib/dotCall64_1.0-0.tar.gz \
  -    https://mirrors.nics.utk.edu/cran/src/contrib/spam_2.2-0.tar.gz \
  -    https://mirrors.nics.utk.edu/cran/src/contrib/fields_9.6.tar.gz \
  -    https://mirrors.nics.utk.edu/cran/src/contrib/ROCR_1.0-7.tar.gz \
  -    https://mirrors.nics.utk.edu/cran/src/contrib/reticulate_1.10.tar.gz \
  -    https://mirrors.nics.utk.edu/cran/src/contrib/tfruns_1.4.tar.gz \
  -    https://mirrors.nics.utk.edu/cran/src/contrib/tensorflow_1.9.tar.gz \
  -    https://mirrors.nics.utk.edu/cran/src/contrib/zeallot_0.1.0.tar.gz \
  -    https://mirrors.nics.utk.edu/cran/src/contrib/keras_2.2.0.tar.gz \
  -    https://mirrors.nics.utk.edu/cran/src/contrib/coda_0.19-1.tar.gz \
  -    https://mirrors.nics.utk.edu/cran/src/contrib/greta_0.2.3.tar.gz 
  +    https://archive.linux.duke.edu/cran/src/contrib/pROC_1.12.1.tar.gz \
  +    https://archive.linux.duke.edu/cran/src/contrib/gtools_3.8.1.tar.gz \
  +    https://archive.linux.duke.edu/cran/src/contrib/gdata_2.18.0.tar.gz \
  +    https://archive.linux.duke.edu/cran/src/contrib/gplots_3.0.1.tar.gz \
  +    https://archive.linux.duke.edu/cran/src/contrib/MLmetrics_1.1.1.tar.gz \
  +    https://archive.linux.duke.edu/cran/src/contrib/yardstick_0.0.1.tar.gz \
  +    https://archive.linux.duke.edu/cran/src/contrib/xgboost_0.71.2.tar.gz \
  +    https://archive.linux.duke.edu/cran/src/contrib/ModelMetrics_1.2.0.tar.gz \
  +    https://archive.linux.duke.edu/cran/src/contrib/caret_6.0-80.tar.gz \
  +    https://archive.linux.duke.edu/cran/src/contrib/e1071_1.7-0.tar.gz \
  +    https://archive.linux.duke.edu/cran/src/contrib/dotCall64_1.0-0.tar.gz \
  +    https://archive.linux.duke.edu/cran/src/contrib/spam_2.2-0.tar.gz \
  +    https://archive.linux.duke.edu/cran/src/contrib/fields_9.6.tar.gz \
  +    https://archive.linux.duke.edu/cran/src/contrib/ROCR_1.0-7.tar.gz \
  +    https://archive.linux.duke.edu/cran/src/contrib/reticulate_1.10.tar.gz \
  +    https://archive.linux.duke.edu/cran/src/contrib/tfruns_1.4.tar.gz \
  +    https://archive.linux.duke.edu/cran/src/contrib/tensorflow_1.9.tar.gz \
  +    https://archive.linux.duke.edu/cran/src/contrib/zeallot_0.1.0.tar.gz \
  +    https://archive.linux.duke.edu/cran/src/contrib/keras_2.2.0.tar.gz \
  +    https://archive.linux.duke.edu/cran/src/contrib/coda_0.19-1.tar.gz \
  +    https://archive.linux.duke.edu/cran/src/contrib/greta_0.2.3.tar.gz 
   
   RUN DEBIAN_FRONTEND=noninteractive R CMD INSTALL \
       pROC_1.12.1.tar.gz \
  
positive.code: 
  
  RUN DEBIAN_FRONTEND=noninteractive wget \
      https://mirrors.nics.utk.edu/cran/src/contrib/pryr_0.1.4.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/htmlwidgets_1.2.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/profvis_0.3.5.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/RcppArmadillo_0.9.100.5.0.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/servr_0.10.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/xaringan_0.7.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/rsconnect_0.8.8.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/PKI_0.1-5.1.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/RJSONIO_1.3-0.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/packrat_0.4.9-3.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/highlight_0.4.7.2.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/pkgdown_1.1.0.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/bookdown_0.7.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/blogdown_0.8.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/cowplot_0.9.3.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/influenceR_0.1.0.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/Rook_1.1-1.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/rgexf_0.15.3.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/visNetwork_2.0.4.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/DiagrammeR_1.0.0.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/tweenr_0.1.5.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/ggforce_0.1.3.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/RgoogleMaps_1.4.2.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/png_0.1-7.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/rjson_0.2.20.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/mapproj_1.2.6.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/jpeg_0.1-8.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/geosphere_1.5-7.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/ggmap_2.6.1.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/ggraph_1.0.2.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/viridis_0.5.1.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/shiny_1.1.0.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/shinyjs_1.0.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/flexdashboard_0.5.1.1.tar.gz 
  
  RUN DEBIAN_FRONTEND=noninteractive R CMD INSTALL \
      pryr_0.1.4.tar.gz \
  
negative.code: 
  # install sparklyr so we can do Spark via Livy
  RUN DEBIAN_FRONTEND=noninteractive wget \
     https://archive.linux.duke.edu/cran/src/contrib/config_0.3.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/dbplyr_1.2.2.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/rappdirs_0.3.1.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/sparklyr_0.8.4.tar.gz
     
  RUN DEBIAN_FRONTEND=noninteractive R CMD INSTALL \
     config_0.3.tar.gz \
  