起きたこと omniauth-twitter gem を入れようとしたら、以下のような感じで怒られる。 Gem::Ext::BuildError: ERROR: Failed to build gem native extension. current directory: /Users/nomura/repos/tsun-doc/vendor/bundle/ruby/2.4.0/gems/json-1.8.3/ext/json/ext/generator /Users/nomura/.rbenv/versions/2.4.0/bin/ruby -r ./siteconf20170103-627-1wq7y31.rb extconf.rb creating Makefile current directory: /Users/nomura/repos/tsun-doc/vendor/bun
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