Error when bringing up vagrant box with libvirt provider.

gistfile1.txt

alwyn@aristotle ~/dev/vagrant % vagrant up --provider=libvirt
Bringing machine 'default' up with 'libvirt' provider...
/opt/vagrant/embedded/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require': incom
0.7.0/_libvirt.so (LoadError)
        from /opt/vagrant/embedded/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `re
        from /opt/vagrant/embedded/gems/gems/ruby-libvirt-0.7.0/lib/libvirt.rb:11:in `<top (req
        from /opt/vagrant/embedded/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `re
        from /opt/vagrant/embedded/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `re
        from /opt/vagrant/embedded/gems/gems/fog-libvirt-0.3.0/lib/fog/libvirt.rb:4:in `<top (r
        from /opt/vagrant/embedded/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `re
        from /opt/vagrant/embedded/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `re
        from /opt/vagrant/embedded/gems/gems/vagrant-libvirt-0.0.36/lib/vagrant-libvirt/driver.
        from /opt/vagrant/embedded/gems/gems/vagrant-libvirt-0.0.36/lib/vagrant-libvirt/provide
        from /opt/vagrant/embedded/gems/gems/vagrant-libvirt-0.0.36/lib/vagrant-libvirt/action/
        from /opt/vagrant/embedded/gems/gems/vagrant-1.9.1/lib/vagrant/action/warden.rb:90:in `
        from /opt/vagrant/embedded/gems/gems/vagrant-1.9.1/lib/vagrant/action/warden.rb:90:in `
        from /opt/vagrant/embedded/gems/gems/vagrant-1.9.1/lib/vagrant/action/warden.rb:20:in `
        from /opt/vagrant/embedded/gems/gems/vagrant-1.9.1/lib/vagrant/action/warden.rb:20:in `
        from /opt/vagrant/embedded/gems/gems/vagrant-1.9.1/lib/vagrant/action/warden.rb:20:in `
        from /opt/vagrant/embedded/gems/gems/vagrant-1.9.1/lib/vagrant/action/builder.rb:170:in
        from /opt/vagrant/embedded/gems/gems/vagrant-1.9.1/lib/vagrant/action/builder.rb:170:in
        from /opt/vagrant/embedded/gems/gems/vagrant-1.9.1/lib/vagrant/action/builtin/call.rb:5
        from /opt/vagrant/embedded/gems/gems/vagrant-1.9.1/lib/vagrant/action/warden.rb:34:in `
        from /opt/vagrant/embedded/gems/gems/vagrant-1.9.1/lib/vagrant/action/builtin/config_va
        from /opt/vagrant/embedded/gems/gems/vagrant-1.9.1/lib/vagrant/action/warden.rb:34:in `
        from /opt/vagrant/embedded/gems/gems/vagrant-1.9.1/lib/vagrant/action/builder.rb:116:in
        from /opt/vagrant/embedded/gems/gems/vagrant-1.9.1/lib/vagrant/action/runner.rb:66:in `
        from /opt/vagrant/embedded/gems/gems/vagrant-1.9.1/lib/vagrant/util/busy.rb:19:in `busy
        from /opt/vagrant/embedded/gems/gems/vagrant-1.9.1/lib/vagrant/action/runner.rb:66:in `
        from /opt/vagrant/embedded/gems/gems/vagrant-1.9.1/lib/vagrant/machine.rb:225:in `actio
        from /opt/vagrant/embedded/gems/gems/vagrant-1.9.1/lib/vagrant/machine.rb:200:in `block
        from /opt/vagrant/embedded/gems/gems/vagrant-1.9.1/lib/vagrant/environment.rb:567:in `l
        from /opt/vagrant/embedded/gems/gems/vagrant-1.9.1/lib/vagrant/machine.rb:186:in `call'
        from /opt/vagrant/embedded/gems/gems/vagrant-1.9.1/lib/vagrant/machine.rb:186:in `actio
        from /opt/vagrant/embedded/gems/gems/vagrant-1.9.1/lib/vagrant/batch_action.rb:82:in `b