Предупреждение в strptime неизвестном часовом поясе при загрузке пакетов

Question

Вероятно, это (надеюсь) легко исправить, но я не знаю, что попробовать. Я пытаюсь загрузить пакет VTrack и получить это:

> install.packages("VTrack")
Installing package into ‘/Users/JoniFitzsimmons/Library/R/3.3/library’
(as ‘lib’ is unspecified)

  There is a binary version available but the source version is later:
       binary source needs_compilation
VTrack   1.11   1.21             FALSE

installing the source package ‘VTrack’

trying URL 'https://cran.rstudio.com/src/contrib/VTrack_1.21.tar.gz'
Content type 'application/x-gzip' length 146180 bytes (142 KB)
==================================================
downloaded 142 KB

Warning in strptime(xx, f <- "%Y-%m-%d %H:%M:%OS", tz = tz) :
  unknown timezone 'default/Australia/Sydney'
* installing *source* package ‘VTrack’ ...
** package ‘VTrack’ successfully unpacked and MD5 sums checked
** R
** data
** inst
** preparing package for lazy loading
Warning: package ‘foreach’ was built under R version 3.3.2
Error in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]) : 
  there is no package called ‘classInt’
ERROR: lazy loading failed for package ‘VTrack’
* removing ‘/Users/JoniFitzsimmons/Library/R/3.3/library/VTrack’
Warning in install.packages :
  installation of package ‘VTrack’ had non-zero exit status

The downloaded source packages are in
 ‘/private/var/folders/rg/b0kybdls3svfw1hgh9236x4c0000gp/T/Rtmp0gCMUm/downloaded_packages’

И пакет не доступен в моих пакетах