2011-06-25 rails consoleのエラーを修正する。 /usr/local/rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/irb/completion.rb:9:in `require': no such file to load -- readline (LoadError) sudo yum install readline-devel cd /usr/local/rvm/src/ruby-1.9.2-p180/ext/readline ruby extconf.rb make make install