• using R Under development (unstable) (2019-11-25 r77460)
• using platform: x86_64-w64-mingw32 (64-bit)
• using session charset: ISO8859-1
• checking for file 'bitops/DESCRIPTION' ... OK
• this is package 'bitops' version '1.0-6'
• checking package namespace information ... OK
• checking package dependencies ... OK
• checking if this is a source package ... OK
• checking if there is a namespace ... OK
• checking for hidden files and directories ... OK
• checking for portable file names ... OK
• checking whether package 'bitops' can be installed ... ERROR
  Installation failed.
  See 'd:/Rcompile/CRANpkg/local/4.0/bitops.Rcheck/00install.out' for details.
• DONE
  See https://www.r-project.org/nosvn/R.check/r-devel-windows-ix86+x86_64/bitops-00install.html for details.