vmare安装centos，ruby
1,虚拟机安装，
2，虚拟机种安装centos
3, centos 安装vmware-tools

3，g++命令不存在
yum install gcc-c++ compat-gcc-32 compat-gcc-32-c++

4, no such file to load -- openssl 错误
yum install openssl-devel

5.libxml2,libxslt is missing.
yum install libxml2-devel
yum install libxslt-devel