anchor.diff:     maps_3.2.0.tar.gz \
      zoo_1.8-1.tar.gz \
      gcookbook_1.0.tar.gz \
  -   corrplot_0.84.tar.gz 
  +   corrplot_0.84.tar.gz \
  +   sparklyr_0.7.0.tar.gz
  +   
   
   # install rmarkdown
   ADD ./conf /r-studio
  
positive.code: # mccahill/r-studio
  #
  # VERSION 1.2
  
  FROM  ubuntu:16.04
  MAINTAINER Mark McCahill "mark.mccahill@duke.edu"
  
  # get R from a CRAN archive 
  RUN  echo   "deb http://cran.rstudio.com/bin/linux/ubuntu xenial/" >>   /etc/apt/sources.list
  RUN DEBIAN_FRONTEND=noninteractive apt-key adv --keyserver keyserver.ubuntu.com --recv-keys  E084DAB9
  
  RUN apt-get  update ; \
  
negative.code:    maps_3.2.0.tar.gz \
     zoo_1.8-1.tar.gz \
     gcookbook_1.0.tar.gz \
     corrplot_0.84.tar.gz \
     sparklyr_0.7.0.tar.gz
  
  
  RUN rm \
  