Requires a recent linux installation. Older systems without python 3.7 will have trouble. See this link for details: https://openwrt.org/docs/guide-developer/quickstart-build-images

Install build packages: sudo apt install build-essential libncurses5-dev gawk git libssl-dev gettext zlib1g-dev swig unzip time rsync python3 python3-setuptools python3-yaml.

First we need to clone and setup our tree. This will result in an openwrt/.

./setup.py --setup

Next we need to select the profile and base package selection. This setup will install the feeds, packages and generate the .config file.

cd openwrt
./scripts/gen_config.py ea8300

Finally we can build the tree.

make -j X V=s