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

转载自：http://www.cnblogs.com/dudu/p/4294238.html