RailsでMysqlを使うときに出たエラーの対処 - QiitaGem::Ext::BuildError: ERROR: Failed to build gem native extension. current directory: /Users/Kento/work/hituji/vendor/bundle/ruby/2.4.0/gems/mysql2-0.4.5/ext/mysql2 /Users/Kento/.rbenv/versions/2.3.0-dev/bin/ruby -r ./siteconf20161220-15918-1p4ufx4.rb extconf.rb checking for rb_absint_size()... yes checking for rb_absint_singlebit_p()... yes checking for ruby/thread.h... yes checking for rb_thread
User認証を簡単に作れるDevise gemを調べた - Qiita
