Redhat Enterprise Linux / CentOSで gem install mysql を実行すると以下のようなエラーで失敗することがあります。 # gem install mysql Building native extensions. This could take a while... ERROR: Error installing mysql: ERROR: Failed to build gem native extension. /usr/local/bin/ruby extconf.rb install mysql checking for mysql_query() in -lmysqlclient... no checking for main() in -lm... yes checking for mysql_query() in -lmysqlcl
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