no such file to load -- readline

安装rails后进入控制台出现如题错误：

/usr/local/lib/ruby/1.8/irb/completion.rb:10:in`require':nosuchfiletoload--readline(LoadError)
from/usr/local/lib/ruby/1.8/irb/completion.rb:10
from/usr/local/lib/ruby/1.8/irb/init.rb:252:in`require'
from/usr/local/lib/ruby/1.8/irb/init.rb:252:in`load_modules'
from/usr/local/lib/ruby/1.8/irb/init.rb:250:in`each'
from/usr/local/lib/ruby/1.8/irb/init.rb:250:in`load_modules'
from/usr/local/lib/ruby/1.8/irb/init.rb:21:in`setup'
from/usr/local/lib/ruby/1.8/irb.rb:54:in`start'
from/usr/local/bin/irb:13

1	rvm pkg installreadline

2	rvm remove 1.9.2

3	rvm install1.9.2 --with-readline-dir=$rvm_path/usr

这中方法比较慢 还有一种比较好的方法，实践可用

On Debian/Ubuntu:

apt-get install libreadline-dev 

Or on RHEL/CentOS, try

yum install readline-devel

然后进入./rvm/src/ruby_path/ext /readline ruby extconf.rb

make && make install

然后就ok了