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http://jewelrybox.wpblog.jp/2017/08/15/centos%e3%81%a7-gem-install-sqlite3-%e3%81%8c%e3%81%a7%e3%81%8d%e3%81%aa%e3%81%84%e6%99%82%e3%81%ae%e5%af%be%e5%87%a6/
CentOSで gem install sqlite3 ができない時の対処