Build Guide

# Download and update the sources
git clone https://git.openwrt.org/openwrt/openwrt.git
cd openwrt
git pull
 
# Select a specific code revision
git branch -a
git tag
git checkout v22.03.0
 
# Update the feeds
./scripts/feeds update -a
./scripts/feeds install -a
 
# Optionally pull in a buildinfo for your build. Here is the buildbot config for v22.03.0
wget https://downloads.openwrt.org/releases/22.03.0/targets/ramips/mt7621/config.buildinfo -O .config
 
# Configure the firmware image, which may be based on the buildinfo
make menuconfig
 
# And optionally the kernel (note that changing the kernel in such a way that a different one is produced will change the vermagic, which will make it incompatible with official opkg kmods)
make -j $(nproc) kernel_menuconfig
 
# Build the firmware image
make -j $(nproc) defconfig download clean world

Buildinfo and .config

When choosing what buildinfo you wish to use, you must consider what you want to end up with at the output. Merely taking the buildinfo file for a version and notr making any changes might be desirable if you wish to go through the logn build procedure of the OpenWRT official buildbot, but usually is not. Often, you'll want to make adjustments or even merge multiple buildinfo files together to achieve the desired result.

An example of a common scenario in which you may wish to merge multiple buildinfo files together is when building a fresh snapshot image based on the master branch of the OpenWRT GIT. Your final .config file will vary heavily based on what your desired result from the build is and what you wish to use the build for. Here is an example .config which was based on both a snapshot buildinfo and a v22.03.0 buildinfo specifically for the ramips MT7621 platform of devices: 

CONFIG_TARGET_ramips=y
CONFIG_TARGET_ramips_mt7621=y
CONFIG_TARGET_MULTI_PROFILE=y
CONFIG_ALL_KMODS=y
CONFIG_ALL_NONSHARED=y
CONFIG_DEVEL=y
CONFIG_TARGET_PER_DEVICE_ROOTFS=y
CONFIG_BPF_TOOLCHAIN_BUILD_LLVM=y
# CONFIG_BPF_TOOLCHAIN_NONE is not set
CONFIG_COLLECT_KERNEL_DEBUG=y
CONFIG_HAS_BPF_TOOLCHAIN=y
CONFIG_KERNEL_BUILD_DOMAIN="buildhost"
CONFIG_KERNEL_BUILD_USER="builder"
CONFIG_MAKE_TOOLCHAIN=y
CONFIG_REPRODUCIBLE_DEBUG_INFO=y
CONFIG_USE_LLVM_BUILD=y
CONFIG_PACKAGE_cgi-io=y
CONFIG_PACKAGE_libbpf=m
CONFIG_PACKAGE_libelf=m
CONFIG_PACKAGE_libiwinfo-lua=y
CONFIG_PACKAGE_liblua=y
CONFIG_PACKAGE_liblucihttp=y
CONFIG_PACKAGE_liblucihttp-lua=y
CONFIG_PACKAGE_libubus-lua=y
CONFIG_PACKAGE_lua=y
CONFIG_PACKAGE_luci=y
CONFIG_PACKAGE_luci-app-firewall=y
CONFIG_PACKAGE_luci-app-opkg=y
CONFIG_PACKAGE_luci-base=y
CONFIG_PACKAGE_luci-lib-base=y
CONFIG_PACKAGE_luci-lib-ip=y
CONFIG_PACKAGE_luci-lib-jsonc=y
CONFIG_PACKAGE_luci-lib-nixio=y
CONFIG_PACKAGE_luci-mod-admin-full=y
CONFIG_PACKAGE_luci-mod-network=y
CONFIG_PACKAGE_luci-mod-status=y
CONFIG_PACKAGE_luci-mod-system=y
CONFIG_PACKAGE_luci-proto-ipv6=y
CONFIG_PACKAGE_luci-proto-ppp=y
CONFIG_PACKAGE_luci-ssl=y
CONFIG_PACKAGE_luci-theme-bootstrap=y
CONFIG_PACKAGE_px5g-wolfssl=y
CONFIG_PACKAGE_qosify=m
CONFIG_PACKAGE_rpcd=y
CONFIG_PACKAGE_rpcd-mod-file=y
CONFIG_PACKAGE_rpcd-mod-iwinfo=y
CONFIG_PACKAGE_rpcd-mod-luci=y
CONFIG_PACKAGE_rpcd-mod-rrdns=y
CONFIG_PACKAGE_tc-full=m
CONFIG_PACKAGE_tc-mod-iptables=m
CONFIG_PACKAGE_uhttpd=y
CONFIG_PACKAGE_uhttpd-mod-ubus=y
CONFIG_PACKAGE_zlib=m