anchor.diff:      cat("Installed data.table to be tested against:",as.character(packageVersion("data.table")),"\n")
       cat("CRAN:\n"); status("cran")
       cat("BIOC:\n"); status("bioc")
  +    cat("TOTAL    :", length(deps), "\n\n")
       cat("Oldest 00check.log (to check no old stale ones somehow missed):\n")
       system("find . -name '00check.log' | xargs ls -lt | tail -1")
       cat("\n")
  
positive.code: R CMD check <failing_package>.tar.gz
  R CMD INSTALL ~/data.table_1.9.6.tar.gz   # CRAN version to establish if fails are really due to data.table
  R CMD check <failing_package>.tar.gz
  ls -1 *.tar.gz | grep -E 'Chicago|dada2|flowWorkspace|LymphoSeq' | parallel ~/build/R-3.5.0/bin/R CMD check &
  
  # Warning: replacing previous import robustbase::sigma by stats::sigma when loading VIM
  # Reinstalling robustbase fixed this warning. Even though it was up to date, reinstalling made a difference.
  
negative.code: # Follow: https://bioconductor.org/install/#troubleshoot-biocinstaller
  # Ensure no library() call in .Rprofile, such as library(bit64)
  source("http://bioconductor.org/biocLite.R")
  biocLite()   # keep repeating until returns with nothing left to do
  # biocLite("BiocUpgrade")
  # This error means it's up to date: "Bioconductor version 3.4 cannot be upgraded with R version 3.3.2"
  