从源码安装gcc 4.8.2

OS: CentOS66

方法参考：

http://blog.csdn.net/deng_sai/article/details/41390967

http://www.pfeng.org/archives/733

http://codersvoice.com/a/webbase/install/08/202014/131.html

预先安装：

yum install zip unzip -y

yum install gstream*

简化步骤

./contrib/download_prerequisites

./configure

make

make install

gcc -v