这里使用组安装包，一次性安装所有开发者工具。
# 先安装epel源 和 更新元数据
yum -y install epel-release
yum makecache
1、查看有那些组安装包可用。
yum grouplist | more
2、搜索一下有哪些和development有关。
yum grouplist | grep development
查到以下内容：
[root@localhost~]# yum grouplist | grep Development
There is no installed groups file.
Maybe run: yum groups mark convert (see man yum)
Development and Creative Workstation
Desktop Platform Development
Development Tools
Server Platform Development
3、我们需要的就是Development Tools这个包。
yum groupinstall "Development Tools"