openwrt/openwrt ? reverse-engineered prompt

Build me a custom Linux-based operating system for an embedded device, like a router. The main goal is to replace the stock firmware with something that's fully open and customizable. It should have a writable filesystem and a package manager, allowing me to install new applications and features whenever I want. This would let me customize the device for specific uses, like advanced home networking or mesh routing.

Please include a modern, browser-based web interface for easy management, like the LuCI interface mentioned in the project's documentation.

To get started, please set up the full build environment for the OpenWrt project. Follow the quickstart guide in the README to download package definitions, install their symlinks, and then build the firmware. For the configuration step, you can just use the default selections for now.