运行程序时遇到找不到libstdc++.so.6问题原因： 
系统是64bit，该库是32bit的，在64bit系统上安装32bit库

解决办法：

1. 查看哪个安装包包含该库：yum provides libstdc++.so.6

libstdc++-4.4.7-4.el6.i686

2. 安装 libstdc++-4.4.7-4.el6.i686

yum install  libstdc++-4.4.7-4.el6.i686

报错： 
–> Finished Dependency Resolution 
Error: Protected multilib versions: libstdc++-4.4.7-4.el6.i686 != libstdc++-4.4.7-3.el6.x86_64 
You could try using –skip-broken to work around the problem 
You could try running: rpm -Va –nofiles –nodigest 
…. 
解决办法： 
yum update libstdc++-4.4.7-3.el6.x86_64 
然后再执行yum install libstdc++-4.4.7-4.el6.i686