Vagrant Failed to Build Gem Native Extension
<p>I'm running Vagrant 1.8.1 on OSX 10.11.3 and I'm trying to install a plugin. While attempting to install I get the following the error:</p>

<pre><code>vagrant plugin install vagrant-libvirt
............

An error occurred while installing ruby-libvirt (0.6.0), and Bundler cannot continue.
Make sure that `gem install ruby-libvirt -v '0.6.0'` succeeds before bundling.

.........
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
</code></pre>

<p>ruby-livirt 0.6.0 has already been installed:</p>

<pre><code># gem list | grep ruby-libvirt
# ruby-libvirt (0.6.0)
</code></pre>

<p><strong>Can I bypass this error since the gem is already installed?</strong></p>