rails console" 提示`require': no such file to load -- readline 的问题

最近在拼命学rails，这个问题似乎在我两台电脑上都出现过，希望写下来能帮到以后学习的同学吧。症状范例 ：

parano@paranoServer:~/rails_projects/sample_app$ rails console
/home/parano/.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)
from /home/parano/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/irb/completion.rb:9:in `<top (required)>'
from /home/parano/.rvm/gems/ruby-1.9.2-p180@rails3tutorial/gems/railties-3.0.9/lib/rails/commands/console.rb:3:in `require'
from /home/parano/.rvm/gems/ruby-1.9.2-p180@rails3tutorial/gems/railties-3.0.9/lib/rails/commands/console.rb:3:in `<top (required)>'
from /home/parano/.rvm/gems/ruby-1.9.2-p180@rails3tutorial/gems/railties-3.0.9/lib/rails/commands.rb:20:in `require'
from /home/parano/.rvm/gems/ruby-1.9.2-p180@rails3tutorial/gems/railties-3.0.9/lib/rails/commands.rb:20:in `<top (required)>'
from script/rails:6:in `require'

T T尝试了各种方法，直到看到这东西 ,解决方法：首先补上这两个东西（Ubuntu, Debian， mac用户自行修改一下咯）

sudo apt-get install libncurses5-dev

sudo apt-get install libreadline5-dev

如果尼没有使用RVM，那么可以按照那文中的方法：

cd /usr/src/ruby-1.8.7-p72/ext/readline

ruby extconf.rb

make

sudo make install

如果用了RVM，那么照葫芦画个瓜啦：

cd ~/.rvm/src/ruby-1.9.2-p180/ext/readline
ruby extconf.rb
make
make install

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That is it! Enjoy ～