Create ubuntu上编译apfree-wifidog教程.md

doc/ubuntu上编译apfree-wifidog教程.md

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+> 编译环境
+
+ubuntu 20.04 LTS版本
+
+> 安装依赖库
++ 安装libubox
+
+```shell
+git clone https://github.com/xfguo/libubox.git
+cd libubox
+cmake -DBUILD_LUA=off
+sudo make install
+```
+
++ 安装libuci
+
+```shell
+git clone https://github.com/jkjuopperi/uci.git
+cd uci
+cmake -DBUILD_LUA=off
+sudo make install
+```
++ 安装其他依赖库
+
+```shell
+sudo apt-get update -y
+sudo apt-get install -y libjson-c-dev
+sudo apt-get install -y libssh2-1-dev
+sudo apt-get install -y libevent-dev
+```
+
++ 安装支持apfree wifidog的iptables库
+
+```shell
+git clone https://github.com/liudf0716/iptables-apfree-wifidog.git
+cd iptables-apfree-wifidog
+./autogen.sh
+./configure --disable-nftables
+make
+sudo make install
+```
+
+> 编译apfree wifidog
+
+```shell
+git clone https://github.com/liudf0716/apfree_wifidog.git
+cd apfree_wifidog
+mkdir build
+cd build
+cmake ..
+make
+```