rails报错：`require': cannot load such file -- openssl (LoadError)

rails创建项目报错：rubygems/custom_require.rb:36:in `require': cannot load such file -- openssl (LoadError)

?

需要执行：

sudo apt-get install ruby1.9.1-dev

sudo apt-get install libssl-dev

?

然后：

cd?~/.rvm/src/ruby-1.9.3-p194/ext/openssl

ruby ?extconf.rb

make; make install;