anchor.diff:  RUN rm \
      sf_0.5-4.tar.gz \
      sp_1.2-5.tar.gz \
  -   units_0.4-6.tar.gz \
      rgdal_1.2-8.tar.gz \
      rgeos_0.3-23.tar.gz \
      maptools_0.9-2.tar.gz \
  
positive.code:  
   
  RUN DEBIAN_FRONTEND=noninteractive R CMD INSTALL \
     units_0.4-6.tar.gz \
     sf_0.5-4.tar.gz \
     sp_1.2-5.tar.gz  \
     rgdal_1.2-8.tar.gz \
  
negative.code: 	
  RUN DEBIAN_FRONTEND=noninteractive wget \
     https://mirrors.nics.utk.edu/cran/src/contrib/sf_0.5-4.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/rgdal_1.2-8.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/rgeos_0.3-23.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/maptools_0.9-2.tar.gz \
  