anchor.diff:  
   # install templates and examples from Reed and the Tufte package
   RUN DEBIAN_FRONTEND=noninteractive wget \
  -   http://archive.linux.duke.edu/cran/src/contrib/BHH2_2016.05.31.tar.gz
  +   https://archive.linux.duke.edu/cran/src/contrib/BHH2_2016.05.31.tar.gz
      
   RUN DEBIAN_FRONTEND=noninteractive R CMD INSTALL \
      BHH2_2016.05.31.tar.gz
  
positive.code:    pbkrtest_0.4-7.tar.gz 
  
  RUN DEBIAN_FRONTEND=noninteractive wget \
     http://archive.linux.duke.edu/cran/src/contrib/SparseM_1.77.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/MatrixModels_0.4-1.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/quantreg_5.33.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/car_2.1-4.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/mosaicData_0.14.0.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/latticeExtra_0.6-28.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/gridExtra_2.2.1.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/ggdendro_0.1-20.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/mnormt_1.5-5.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/psych_1.7.5.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/broom_0.4.2.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/reshape_0.8.6.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/prettyunits_1.0.2.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/progress_1.1.2.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/GGally_1.3.1.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/mosaic_0.14.4.tar.gz 
  
  RUN DEBIAN_FRONTEND=noninteractive R CMD INSTALL \
     SparseM_1.77.tar.gz \
  
negative.code:    dplyr_0.7.0.tar.gz 
  
  RUN DEBIAN_FRONTEND=noninteractive wget \
     https://archive.linux.duke.edu/cran/src/contrib/chron_2.3-50.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/data.table_1.10.4.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/rematch_1.0.1.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/cellranger_1.1.0.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/tidyr_0.6.3.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/googlesheets_0.2.2.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/hms_0.3.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/readr_1.1.1.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/purrr_0.2.2.2.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/selectr_0.3-1.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/rvest_0.3.2.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/pbkrtest_0.4-7.tar.gz 
  
  RUN DEBIAN_FRONTEND=noninteractive R CMD INSTALL \
     chron_2.3-50.tar.gz \
  