方便起见，我直接安装了虚拟机使用，安装版本：CentOS-7-x86_64-Minimal-1611
一切安装就绪后，先更新系统，然后建议以非 root 用户启动进行编译。

yum update
yum install git -y
yum install perl -y


1、下载源码，可使用如下命令下载最新版本。由于这样下载缓慢，我直接从网页下载了zip包，解压后直接 winSCP 上传到虚拟主机上，速度快很多。

git clone https://github.com/openwrt/openwrt.git
svn checkout https://github.com/openwrt/openwrt.git

2、下载feeds

//在openwrt目录中执行
./scripts/feeds update -a
./scripts/feeds install -a

3、make defconfig，检查依赖项，报错，以及解决方法如下：

Build dependency: Please install the GNU C Compiler (gcc)
yum -y install gcc

Build dependency: Please reinstall the GNU C Compiler - it appears to be broken
Build dependency: Please install the GNU C++ Compiler (g++)
Build dependency: Please reinstall the GNU C++ Compiler - it appears to be broken
yum -y install gcc-c++

Build dependency: Please install ncurses. (Missing libncurses.so or ncurses.h)
yum -y install ncurses-devel

Build dependency: Please install a static zlib. (Missing libz.a or zlib.h)
yum -y install zlib-static

Build dependency: Please install the openssl library (with development headers)
yum -y install openssl-devel

Build dependency: Please install the Perl Thread::Queue module
yum -y install perl-Thread-Queue

Build dependency: Please install GNU 'patch'
yum -y install patch

Build dependency: Please install 'unzip'
yum -y install unzip

Build dependency: Please install 'bzip2'
yum -y install bzip2

Build dependency: Please install GNU 'wget'
yum -y install wget

Build dependency: Please install the Subversion client
yum -y install svn