CentOS／Ubuntu ROR环境搭建错误，详情在内，请问如何解决？谢谢！

[zxy]

@huacnlee
Ubuntu Server 12.04按照ruby-china.org/wiki/install_ruby_guide按照ruby，卡在ruby-2.0.0-p247 - #importing default gemsets, this may take time...........
怎么解决，强制结束后，安装rails报错如下
gem install rails --version 4.0.0 --no-ri --no-rdoc
Building native extensions. This could take a while...
ERROR: Error installing rails:
ERROR: Failed to build gem native extension.

thx!