anchor.diff:     http://mirrors.nics.utk.edu/cran/src/contrib/readr_0.2.2.tar.gz \
      http://mirrors.nics.utk.edu/cran/src/contrib/selectr_0.2-3.tar.gz \
      http://mirrors.nics.utk.edu/cran/src/contrib/rvest_0.3.1.tar.gz \
  -   http://mirrors.nics.utk.edu/cran/src/contrib/pbkrtest_0.4-5.tar.gz 
  +   http://mirrors.nics.utk.edu/cran/src/contrib/pbkrtest_0.4-6.tar.gz 
   
   RUN DEBIAN_FRONTEND=noninteractive R CMD INSTALL \
      chron_2.3-47.tar.gz \
  
positive.code:    readr_0.2.2.tar.gz \
     selectr_0.2-3.tar.gz \
     rvest_0.3.1.tar.gz \
     pbkrtest_0.4-5.tar.gz 
  
  RUN rm \
     chron_2.3-47.tar.gz \
  
negative.code:    readr_0.2.2.tar.gz \
     selectr_0.2-3.tar.gz \
     rvest_0.3.1.tar.gz \
     pbkrtest_0.4-6.tar.gz 
  
  RUN DEBIAN_FRONTEND=noninteractive wget \
     http://mirrors.nics.utk.edu/cran/src/contrib/SparseM_1.7.tar.gz \
  