on OS X 10.9.4
$ vagrant plugin install vagrant-vbguest
Installing the 'vagrant-vbguest' plugin. This can take a few minutes...
Bundler, the underlying system Vagrant uses to install plugins,
reported an error. The error is shown below. These errors are usually
caused by misconfigured plugin installations or transient network
issues. The error from Bundler is:
An error occurred while installing nokogiri (1.6.3.1), and Bundler cannot continue.
Make sure that gem install nokogiri -v '1.6.3.1' succeeds before bundling.
$ ls -l $(which vagrant)
lrwxr-xr-x 1 root wheel 33 Jul 22 16:14 /usr/bin/vagrant -> /Applications/Vagrant/bin/vagrant
$ vagrant --version
Vagrant 1.6.3
Version: unspecified
Severity: major
OS: Mac OS X 10.9
Platform: Macintosh
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=69052