急いでいる人のために、先に解決方法を書いておくと $ sudo yum install mysql-devel をしてから $ gem install mysql2 をすれば良い。 EC2でAmazon Linuxを借りて、 gem install mysql2 をしたら、以下の様に怒られたので対処法を書いておく。 Building native extensions. This could take a while... ERROR: Error installing mysql2: ERROR: Failed to build gem native extension. /home/ec2-user/.rbenv/versions/2.1.2/bin/ruby extconf.rb checking for ruby/thread.h... yes checking for rb_th
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