環境 && 起こったこと OS: macOS Sierra Ruby: 2.3.1 Rails: 5.0.0.1 bundle install したときに mysql2 のところでこけた。 $ bundle install (諸々のgemのインストールのログは省略) Gem::Ext::BuildError: ERROR: Failed to build gem native extension. current directory: /Users/akito/git/media/vendor/bundle/gems/mysql2-0.4.4/ext/mysql2 /Users/akito/.rbenv/versions/2.3.1/bin/ruby -r ./siteconf20160929-55293-192vx35.rb extconf.rb checking for ruby/th
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