You'd better not use root to make it, or you may be not able to use.
Default username is root and password is password, login address: 192.168.1.1.

Ubuntu 18.04 LTS x86_64 (16.04 LTS is OK)
At least 2G RAM & 2 CPU Cores
At least 25G HDD

sudo apt-get update -y
sudo apt-get full-upgrade -y
sudo apt-get install -y build-essential asciidoc binutils bzip2 gawk gettext git libncurses5-dev libz-dev patch unzip zlib1g-dev lib32gcc1 libc6-dev-i386 subversion flex uglifyjs git-core gcc-multilib g++-multilib p7zip p7zip-full msmtp libssl-dev texinfo libreadline-dev libglib2.0-dev xmlto qemu-utils upx libelf-dev autoconf automake libtool autopoint ccache curl wget vim nano python python3 python-pip python3-pip python-ply python3-ply haveged lrzsz device-tree-compiler scons

git clone https://github.com/project-openwrt/openwrt -b master && cd openwrt
./scripts/feeds update -a && ./scripts/feeds install -a

For developer, you may use dev branch instead of master.

make menuconfig

make -j1 V=s

Package jsda: jsda/packages2.
luci-theme-netgearv2 source: tracemouse/luci-theme-netgear.
luci-app-serverchan source: tty228/luci-app-serverchan.
OpenAppFilter source: destan19/OpenAppFilter.
luci-app-smartinfo source: animefansxj/luci-app-smartinfo.
luci-app-koolproxy source: Baozisoftware/luci-app-koolproxy.
luci-app-k3screenctrl source: Hill-98/luci-app-k3screenctrl.
luci-app-smstool source: f8q8/luci-app-smstool-master.
luci-app-airwhu source: KyleRicardo/luci-app-airwhu.
Package Lienol: Lienol/openwrt-package.
luci-app-bbr-mod source: ntlf9t/luci-app-bbr-mod.
Package Openwrt-BBR: anshi233/Openwrt-BBR.
simple-obfs source: aa65535/openwrt-simple-obfs.
v2ray-plugin source: honwen/openwrt-v2ray-plugin.
Package zxlhhyccc: zxlhhyccc/MY-lede.
luci-theme-argonv3 source: jerrykuku/luci-theme-argon.
luci-theme-darkmatter source: apollo-ng/luci-theme-darkmatter.
luci-app-koolproxyR source: Ameykyl/luci-app-koolproxyR.
openwrt-chinadns-ng source: pexcn/openwrt-chinadns-ng.
luci-app-ssr-plus-Jo source: Leo-Jo-My/luci-app-ssr-plus-Jo.
openwrt-udpspeeder source: pexcn/openwrt-udpspeeder.
luci-app-onliner source: rufengsuixing/luci-app-onliner.
luci-app-dockerman source: lisaac/luci-app-dockerman.
luci-lib-docker source: lisaac/luci-lib-docker.
openwrt-iptvhelper source: riverscn/openwrt-iptvhelper.
luci-app-autoipsetadder source: rufengsuixing/luci-app-autoipsetadder.
luci-app-adguardhome source: rufengsuixing/luci-app-adguardhome.