Installation Failed

[mpnelsen]

Hi,
I'm trying to install mapast from GitHub, and my installation is failing. Trying to install on R 3.4.1 on a MacBook Pro. I get the following output. Any advice? Do I just need to update. 3.4.2 or should this still work on 3.4.1? Thanks much!

install_github("macroecology/mapast")
Downloading GitHub repo macroecology/mapast@master
from URL https://api.github.com/repos/macroecology/mapast/zipball/master
Installing mapast
'/Library/Frameworks/R.framework/Resources/bin/R' --no-site-file --no-environ
--no-save --no-restore --quiet CMD INSTALL
'/private/var/folders/29/fqydvs2s7ns6k0jg44mgcgbr0000gn/T/RtmpTm4NgP/devtoolsd5253e3d8084/macroecology-mapast-a7c2ef8'
--library='/Library/Frameworks/R.framework/Versions/3.4/Resources/library'
--install-tests

• installing source package ‘mapast’ ...
  Warning in as.POSIXlt.POSIXct(x, tz) :
  unknown timezone 'zone/tz/2018c.1.0/zoneinfo/America/Chicago'
  ** R
  Error in parse(outFile) :
  /private/var/folders/29/fqydvs2s7ns6k0jg44mgcgbr0000gn/T/RtmpTm4NgP/devtoolsd5253e3d8084/macroecology-mapast-a7c2ef8/R/functi:120:30: unexpected '::'
  119:
  120: pts <- base::base::
  ^
  ERROR: unable to collate and parse R files for package ‘mapast’
• removing ‘/Library/Frameworks/R.framework/Versions/3.4/Resources/library/mapast’
  Installation failed: Command failed (1)