vagrant plugin install vagrant-digitalocean I get errors:An error occurred while installing ffi (1.9.5), and Bundler cannot continue.
Make sure that `gem install ffi -v '1.9.5'` succeeds before bundling.
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
/Applications/Vagrant/embedded/bin/ruby extconf.rb
/Applications/Vagrant/embedded/bin/ruby: invalid option -H (-h will show valid options) (RuntimeError)
Gem files will remain installed in /Volumes/Data HD/.vagrant.d/gems/gems/ffi-1.9.5 for inspection.
Results logged to /Volumes/Data HD/.vagrant.d/gems/gems/ffi-1.9.5/ext/ffi_c/gem_make.out--
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