can not install vagrant-vbguest - ruby

Question

I am unable to install vagrant-vbguest on OS X 10.10.4, because it says it can't install Nokogiri.
I have:
ruby 2.0.0p481 (2014-05-08 revision 45883) [universal.x86_64-darwin14]
Vagrant 1.6.2
VirtualBox 4.3.12
The maddening thing is that I do have nokogiri installed already:
> whereis nokogiri
/usr/bin/nokogiri
> /usr/bin/nokogiri -v
# Nokogiri (1.6.6.2)
---
warnings: []
nokogiri: 1.6.6.2
ruby:
version: 2.0.0
platform: universal.x86_64-darwin14
description: ruby 2.0.0p481 (2014-05-08 revision 45883) [universal.x86_64-darwin14]
engine: ruby
libxml:
binding: extension
source: packaged
libxml2_path: /Library/Ruby/Gems/2.0.0/gems/nokogiri-1.6.6.2/ports/x86_64-apple-darwin14/libxml2/2.9.2
libxslt_path: /Library/Ruby/Gems/2.0.0/gems/nokogiri-1.6.6.2/ports/x86_64-apple-darwin14/libxslt/1.1.28
libxml2_patches:
- 0001-Revert-Missing-initialization-for-the-catalog-module.patch
- 0002-Fix-missing-entities-after-CVE-2014-3660-fix.patch
libxslt_patches:
- 0001-Adding-doc-update-related-to-1.1.28.patch
- 0002-Fix-a-couple-of-places-where-f-printf-parameters-wer.patch
- 0003-Initialize-pseudo-random-number-generator-with-curre.patch
- 0004-EXSLT-function-str-replace-is-broken-as-is.patch
- 0006-Fix-str-padding-to-work-with-UTF-8-strings.patch
- 0007-Separate-function-for-predicate-matching-in-patterns.patch
- 0008-Fix-direct-pattern-matching.patch
- 0009-Fix-certain-patterns-with-predicates.patch
- 0010-Fix-handling-of-UTF-8-strings-in-EXSLT-crypto-module.patch
- 0013-Memory-leak-in-xsltCompileIdKeyPattern-error-path.patch
- 0014-Fix-for-bug-436589.patch
- 0015-Fix-mkdir-for-mingw.patch
compiled: 2.9.2
loaded: 2.9.2
And I can reinstall it individually:
> sudo gem install nokogiri -v '1.6.6.2'
Building native extensions. This could take a while...
Successfully installed nokogiri-1.6.6.2
1 gem installed
And yet:
> sudo 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 (1.6.6.2), and Bundler cannot continue.
Make sure that `gem install nokogiri -v '1.6.6.2'` succeeds before bundling.
Also:
> vagrant plugin update
Updating installed plugins...
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 (1.6.6.2), and Bundler cannot continue.
Make sure that `gem install nokogiri -v '1.6.6.2'` succeeds before bundling.
It does look like the problem has nothing to do with nokogiri, but I was not able to find a solution.
Any ideas?

Answer 1

This question is quite old, but searchable. Vagrant is pluggable, and I expect it embeds Ruby, instead of working with the system Ruby you might use for scripting.
You shouldn't have to worry about Ruby gems anyway because you can install plugins right from your Vagrantfile:
# Install required plugins
required_plugins = %w( vagrant-vbguest )
plugin_installed = false
required_plugins.each do |plugin|
unless Vagrant.has_plugin?(plugin)
system "vagrant plugin install #{plugin}"
plugin_installed = true
end
end