anchor.diff:  
   cd ~/build/revdeplib/
   export R_LIBS=~/build/revdeplib/
  -R CMD INSTALL ~/data.table_1.9.7.tar.gz       # ** ensure latest version installed **
  +R CMD INSTALL ~/data.table_1.9.9.tar.gz       # ** ensure latest version installed **
   R
   
   # Follow: https://bioconductor.org/install/#troubleshoot-biocinstaller
  
positive.code: q("no")
  ### END ONE TIME BUILD
  
  R300 CMD INSTALL ~/data.table_1.9.7.tar.gz
  R300
  require(data.table)
  test.data.table()
  test.data.table(verbose=TRUE)
  
  
  ###############################################
  
negative.code: require(bit64)
  test.data.table()     # slower than usual of course due to UBSAN and ASAN. Too slow to run R CMD check.
  # Throws /0 errors on R's summary.c (tests 648 and 1185.2) but ignore those: https://bugs.r-project.org/bugzilla3/show_bug.cgi?id=16000
  q("no")
  
  
  