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CentOS 6.6自带的是Python 2.6.6，而编译llvm需要Python 2.7以上。
checking for python... /usr/bin/python
checking for python >= 2.7... not found
configure: error: found python 2.6.6 (/usr/bin/python); required >= 2.7
yum中最新的也是Python 2.6.6，只能下载Python 2.7.9的源代码自己编译安装。
操作步骤如下：
1）安装devtoolset
yum groupinstall "Development tools"
2）安装编译Python需要的包包
yum install zlib-devel
yum install bzip2-devel
yum install openssl-devel
yum install ncurses-devel
yum install sqlite-devel
3）下载并解压Python 2.7.9的源代码
cd /opt
wget --no-check-certificate https://www.python.org/ftp/python/2.7.9/Python-2.7.9.tar.xz
tar xf Python-2.7.9.tar.xz
cd Python-2.7.9
4）编译与安装Python 2.7.9
./configure --prefix=/usr/local
make && make altinstall
5）将python命令指向Python 2.7.9
ln -s /usr/local/bin/python2.7 /usr/local/bin/python
6）检查Python版本
sh
sh-4.1# python -V
Python 2.7.9
7）如果运行python还是原来的老版本的话，可以参考linux设置环境变量
