在 x86 平台编译可直接参考官方文档，在 arm 平台编译需要略作修改
编译后固件位于./bin/targets
总体上与 X86 一样，安装依赖：
修改配置Languages > Go > Configuration > External bootstrap Go root directory，填/usr/lib/go
否则编译会报错
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apt update -y
apt install -y ack antlr3 asciidoc autoconf automake autopoint binutils bison build-essential \
bzip2 ccache clang cmake cpio curl device-tree-compiler ecj fastjar flex gawk gettext gcc-multilib \
g++-multilib git gnutls-dev gperf haveged help2man intltool lib32gcc-s1 libc6-dev-i386 libelf-dev \
libglib2.0-dev libgmp3-dev libltdl-dev libmpc-dev libmpfr-dev libncurses-dev libpython3-dev \
libreadline-dev libssl-dev libtool libyaml-dev libz-dev lld llvm lrzsz mkisofs msmtp nano \
ninja-build p7zip p7zip-full patch pkgconf python3 python3-pip python3-ply python3-docutils \
python3-pyelftools qemu-utils re2c rsync scons squashfs-tools subversion swig texinfo uglifyjs \
upx-ucl unzip vim wget xmlto xxd zlib1g-dev zstd
git clone https://github.com/immortalwrt/immortalwrt --depth=1
cd immortalwrt
./scripts/feeds update -a
./scripts/feeds install -a
make menuconfig # 非首次编译 make defconfig
make V=s -j$(nproc)apt install -y ack antlr3 asciidoc autoconf automake autopoint binutils bison build-essential \
bzip2 ccache clang cmake cpio curl device-tree-compiler ecj fastjar flex gawk gettext gcc-arm-linux-gnueabihf \
g++-arm-linux-gnueabihf git gnutls-dev gperf haveged help2man intltool lib32gcc-s1-amd64-cross libc6-dev-i386-amd64-cross \
libelf-dev libglib2.0-dev libgmp3-dev libltdl-dev libmpc-dev libmpfr-dev libncurses-dev libpython3-dev \
libreadline-dev libssl-dev libtool libyaml-dev libz-dev lld llvm lrzsz mkisofs msmtp nano \
ninja-build p7zip p7zip-full patch pkgconf python3 python3-pip python3-ply python3-docutils \
python3-pyelftools qemu-utils re2c rsync scons squashfs-tools subversion swig texinfo uglifyjs \
upx-ucl unzip vim wget xmlto xxd zlib1g-dev zstd(/usr/lib/go) External bootstrap Go root directory