1.安装ubuntu 20.04.3
sudo apt-get update -y
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
2.下载源码：
git clone https://github.com/coolsnowwolf/lede
git clone https://github.com/openwrt/openwrt
3.查看并切换到新的稳定版tag（分支）：
cd openwrt
git tag
git checkout v21.02.2
4.自定义要安装的包，修改openwrt的include/target.mk文件，在
DEFAULT_PACKAGES:=\
base-files \
ca-bundle \
dropbear \
fstools \
libc \
libgcc \
libustream-wolfssl \
logd \
mtd \
netifd \
opkg \
uci \
uclient-fetch \
urandom-seed \
urngd
后面加上自己想要编译的内容:
DEFAULT_PACKAGES:=base-files libc libgcc busybox dropbear mtd uci opkg netifd fstools uclient-fetch logd default-settings luci luci-app-aliddns luci-app-upnp luci-app-adbyby-plus luci-app-autoreboot luci-app-ssr-plus ddns-scripts_aliyun luci-app-vlmcsd luci-app-ramfree luci-app-flowoffload
