linux下进入rails console提示cannot load such file -- readline

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在linux下输入rails console，之后提示错误，如下：

/usr/local/ruby/lib/ruby/1.9.1/irb/completion.rb:9:in `require': cannot load such file -- readline (LoadError)

        from /usr/local/ruby/lib/ruby/1.9.1/irb/completion.rb:9:in `'

        from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/railties-3.1.3/lib/rails/commands/console.rb:3:in `require'

        from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/railties-3.1.3/lib/rails/commands/console.rb:3:in `'

        from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/railties-3.1.3/lib/rails/commands.rb:37:in `require'

        from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/railties-3.1.3/lib/rails/commands.rb:37:in `'

        from script/rails:6:in `require'

        from script/rails:6:in `

'

需要先安装readline，命令如下：

apt-get install libreadline5-dev

再进入到ruby源码中，重新编译readline，命令如下：

cd ext/readline
ruby extconf.rb
make
sudo make install

即可。