gistfile1.txt

$ vagrant up
Bringing machine 'default' up with 'libvirt' provider...
/usr/share/gems/gems/nokogiri-1.6.7.2/lib/nokogiri.rb:29:in `require': cannot load such file -- nokogiri/nokogiri (LoadError)
	from /usr/share/gems/gems/nokogiri-1.6.7.2/lib/nokogiri.rb:29:in `rescue in <top (required)>'
	from /usr/share/gems/gems/nokogiri-1.6.7.2/lib/nokogiri.rb:25:in `<top (required)>'
	from /home/alr/.vagrant.d/gems/gems/vagrant-libvirt-0.0.33/lib/vagrant-libvirt/action/prepare_nfs_settings.rb:1:in `require'
	from /home/alr/.vagrant.d/gems/gems/vagrant-libvirt-0.0.33/lib/vagrant-libvirt/action/prepare_nfs_settings.rb:1:in `<top (required)>'
	from /home/alr/.vagrant.d/gems/gems/vagrant-libvirt-0.0.33/lib/vagrant-libvirt/action.rb:43:in `block (2 levels) in action_up'
	from /usr/share/vagrant/lib/vagrant/action/builtin/call.rb:47:in `call'
	from /usr/share/vagrant/lib/vagrant/action/builtin/call.rb:47:in `call'
	from /usr/share/vagrant/lib/vagrant/action/warden.rb:34:in `call'
	from /usr/share/vagrant/lib/vagrant/action/builtin/config_validate.rb:25:in `call'
	from /usr/share/vagrant/lib/vagrant/action/warden.rb:34:in `call'
	from /usr/share/vagrant/lib/vagrant/action/builder.rb:116:in `call'
	from /usr/share/vagrant/lib/vagrant/action/runner.rb:66:in `block in run'
	from /usr/share/vagrant/lib/vagrant/util/busy.rb:19:in `busy'
	from /usr/share/vagrant/lib/vagrant/action/runner.rb:66:in `run'
	from /usr/share/vagrant/lib/vagrant/machine.rb:224:in `action_raw'
	from /usr/share/vagrant/lib/vagrant/machine.rb:199:in `block in action'
	from /usr/share/vagrant/lib/vagrant/environment.rb:561:in `lock'
	from /usr/share/vagrant/lib/vagrant/machine.rb:185:in `call'
	from /usr/share/vagrant/lib/vagrant/machine.rb:185:in `action'
	from /usr/share/vagrant/lib/vagrant/batch_action.rb:82:in `block (2 levels) in run'

Andrew, can you please check if you have installed nokogiri through gem install of dnf install.

Here is info from my Fedora 23

[lmohanty@LalatenduM-laptop ~]$ sudo rpm -qa | grep 'ruby\|vagrant' | grep libvirt
vagrant-libvirt-0.0.32-1.fc23.noarch
rubygem-ruby-libvirt-0.6.0-1.fc23.x86_64
rubygem-fog-libvirt-0.0.3-1.fc23.noarch

[lmohanty@LalatenduM-laptop ~]$ sudo rpm -qa | grep -i nokogiri
rubygem-nokogiri-1.6.7.2-1.fc23.x86_64