On OSX
$ vagrant plugin install vagrant-berkshelf --plugin-version '>= 2.0.1'
Installing the 'vagrant-berkshelf --version '>= 2.0.1'' plugin. This can take a few minutes...
/Applications/Vagrant/embedded/lib/ruby/1.9.1/rubygems/dependency_installer.rb:153:in gather_dependencies': Unable to resolve dependencies: vagrant-berkshelf requires celluloid (~> 0.16.0.pre), celluloid-io (~> 0.16.0.pre); berkshelf requires addressable (~> 2.3.4), berkshelf-api-client (~> 1.2), buff-config (~> 1.0), buff-extensions (~> 1.0), buff-shell_out (~> 0.1), faraday (~> 0.9.0), minitar (~> 0.5.4), retryable (~> 1.3.3), ridley (~> 4.0), solve (~> 1.1), thor (~> 0.18), octokit (~> 3.0), celluloid (~> 0.16.0.pre), celluloid-io (~> 0.16.0.pre) (Gem::DependencyError) from /Applications/Vagrant/embedded/lib/ruby/1.9.1/rubygems/dependency_installer.rb:267:ininstall'
from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/plugins/commands/plugin/action/install_gem.rb:49:in block in call' from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/plugins/commands/plugin/gem_helper.rb:42:inblock in with_environment'
from /Applications/Vagrant/embedded/lib/ruby/1.9.1/rubygems/user_interaction.rb:40:in use_ui' from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/plugins/commands/plugin/gem_helper.rb:41:inwith_environment'
from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/plugins/commands/plugin/action/install_gem.rb:39:in call' from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/lib/vagrant/action/warden.rb:34:incall'
from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/plugins/commands/plugin/action/bundler_check.rb:20:in call' from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/lib/vagrant/action/warden.rb:34:incall'
from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/lib/vagrant/action/builder.rb:116:in call' from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/lib/vagrant/action/runner.rb:61:inblock in run'
from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/lib/vagrant/util/busy.rb:19:in busy' from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/lib/vagrant/action/runner.rb:61:inrun'
from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/plugins/commands/plugin/command/base.rb:17:in action' from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/plugins/commands/plugin/command/install.rb:27:inexecute'
from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/plugins/commands/plugin/command/root.rb:52:in execute' from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/lib/vagrant/cli.rb:38:inexecute'
from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/lib/vagrant/environment.rb:478:in cli' from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/bin/vagrant:96:in<top (required)>'
from /Applications/Vagrant/bin/../embedded/gems/bin/vagrant:23:in load' from /Applications/Vagrant/bin/../embedded/gems/bin/vagrant:23:in'
On OSX $ vagrant plugin install vagrant-berkshelf --plugin-version '>= 2.0.1' Installing the 'vagrant-berkshelf --version '>= 2.0.1'' plugin. This can take a few minutes... /Applications/Vagrant/embedded/lib/ruby/1.9.1/rubygems/dependency_installer.rb:153:in'
gather_dependencies': Unable to resolve dependencies: vagrant-berkshelf requires celluloid (~> 0.16.0.pre), celluloid-io (~> 0.16.0.pre); berkshelf requires addressable (~> 2.3.4), berkshelf-api-client (~> 1.2), buff-config (~> 1.0), buff-extensions (~> 1.0), buff-shell_out (~> 0.1), faraday (~> 0.9.0), minitar (~> 0.5.4), retryable (~> 1.3.3), ridley (~> 4.0), solve (~> 1.1), thor (~> 0.18), octokit (~> 3.0), celluloid (~> 0.16.0.pre), celluloid-io (~> 0.16.0.pre) (Gem::DependencyError) from /Applications/Vagrant/embedded/lib/ruby/1.9.1/rubygems/dependency_installer.rb:267:in
install' from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/plugins/commands/plugin/action/install_gem.rb:49:inblock in call' from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/plugins/commands/plugin/gem_helper.rb:42:in
block in with_environment' from /Applications/Vagrant/embedded/lib/ruby/1.9.1/rubygems/user_interaction.rb:40:inuse_ui' from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/plugins/commands/plugin/gem_helper.rb:41:in
with_environment' from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/plugins/commands/plugin/action/install_gem.rb:39:incall' from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/lib/vagrant/action/warden.rb:34:in
call' from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/plugins/commands/plugin/action/bundler_check.rb:20:incall' from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/lib/vagrant/action/warden.rb:34:in
call' from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/lib/vagrant/action/builder.rb:116:incall' from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/lib/vagrant/action/runner.rb:61:in
block in run' from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/lib/vagrant/util/busy.rb:19:inbusy' from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/lib/vagrant/action/runner.rb:61:in
run' from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/plugins/commands/plugin/command/base.rb:17:inaction' from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/plugins/commands/plugin/command/install.rb:27:in
execute' from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/plugins/commands/plugin/command/root.rb:52:inexecute' from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/lib/vagrant/cli.rb:38:in
execute' from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/lib/vagrant/environment.rb:478:incli' from /Applications/Vagrant/embedded/gems/gems/vagrant-1.3.5/bin/vagrant:96:in
<top (required)>' from /Applications/Vagrant/bin/../embedded/gems/bin/vagrant:23:inload' from /Applications/Vagrant/bin/../embedded/gems/bin/vagrant:23:in