解决办法：
 1、执行命令： yum whatprovides libstdc++.so.6
 
然后会提示哪个安装包有这个库文件如下：
 
[root@localhost ~]# yum whatprovides libstdc++.so.6
 Loaded plugins: aliases, changelog, downloadonly, fastestmirror, kabi, presto, refresh-packagekit, security, tmprepo, verify,
              : versionlock
 Loading support for CentOS kernel ABI
 Loading mirror speeds from cached hostfile
  * base: centos.ustc.edu.cn
  * centosplus: centos.ustc.edu.cn
  * contrib: centos.ustc.edu.cn
  * extras: centos.ustc.edu.cn
  * updates: centos.ustc.edu.cn
 libstdc++-4.4.7-3.el6.i686 : GNU Standard C++ Library
 Repo        : base
 Matched from:
 Other      : libstdc++.so.6

2、然后执行：
 
yum install libstdc++-4.4.7-3.el6.i686

搞定！