Vagrant cannot install nokogiri-dependent plugins

Question

I\'m trying to install the rackspace plugin for vagrant (1.5.1):

vagrant plugin install vagrant-rackspace

But it complains

Answer 1

Similarly with my case, I have an issue while installing vagrant-omnibus plugin for Vagrant 1.6.3 on OSX Mavericks 10.9.4 and ruby 2.0.0p247 rbenv.

I tried setting the env NOKOGIRI_USE_SYSTEM_LIBRARIES to 1 or true, then update+install but the same error still there.

I found that there is a suggestion in https://github.com/mitchellh/vagrant/issues/3769 to use the specify the baked in nokogiri version and this works for me. So, I also wrote a quick noted for myself to refer this unfortunates issue.