installed size is 20.1Mb
  sub-directories of 1Mb or more:
    extdata   1.6Mb
    libs     17.4Mb
Installation failed.
See ‘/Volumes/Builds/packages/high-sierra-x86_64/results/4.2/vol2birdR.Rcheck/00install.out’ for details.
Installation failed.
See ‘/Volumes/Builds/packages/high-sierra-x86_64/results/4.1/vol2birdR.Rcheck/00install.out’ for details.
Installation failed.
See 'd:/Rcompile/CRANpkg/local/4.1/vol2birdR.Rcheck/00install.out' for details.