如何配置OpenWrt开发环境
安装虚拟机，Virtualbox或者VMvare
安装Ubuntu 16.04 或者 18.04 64位系统
安装开发环境，选择速度最快的源，然后执行 sudo apt-get update；接下来执行
Ubuntu 16.04：sudo apt-get install gcc g++ binutils patch bzip2 flex bison make autoconf gettext texinfo unzip sharutils libncurses5-dev ncurses-term zlib1g-dev gawk asciidoc libz-dev git-core uuid-dev libacl1-dev liblzo2-dev pkg-config libc6-dev curl libxml-parser-perl ocaml-nox
Ubuntu 18.04：sudo apt-get install subversion build-essential libncurses5-dev zlib1g-dev gawk git ccache gettext libssl-dev xsltproc zip
Ubuntu 20.04：sudo apt-get -y install build-essential asciidoc binutils bzip2 gawk gettext git libncurses5-dev libz-dev patch python3 python2.7 unzip zlib1g-dev lib32gcc1 libc6-dev-i386 subversion flex uglifyjs git-core gcc-multilib p7zip p7zip-full msmtp libssl-dev texinfo libglib2.0-dev xmlto qemu-utils upx libelf-dev autoconf automake libtool autopoint device-tree-compiler g++-multilib antlr3 gperf wget curl swig rsync
下载OpenWrt源码，执行 git clone https://git.lede-project.org/source.git lede，大家可以根据自己的实际需求来checkout代码，比如
git clone git://git.openwrt.org/openwrt.git 或者 git clone https://github.com/openwrt/openwrt.git
对于新手来说，可追加执行 git checkout openwrt-18.06 或者 git checkout openwrt-19.07 checkout 稳定版系统，来保证代码编译不出错。
编译系统 make V=99
参考文档：https://openwrt.org/docs/guide-developer/build-system/install-buildsystem