require 'net/https' no such file to load -- openssl

apt-get install openssl libssl-dev  

cd rubySourceRoot/ext/openssl  
ruby extconf.rb  
make   
sudo make install 

nnd,编译安装的ruby1.9，当require 'net/https'的时候出现no such file to load -- openssl，搜索了半天才找到上面的办法...