Complex embedded systems can be built out of open-source software components. However, these have to be downloaded, cross-compiled, and installed in the target filesystem. Buildroot is a simple and efficient set of scripts that automates all these steps for Linux-based systems. It gives the developer the opportunity to select and configure the components he needs in a graphical interface. Buildroot then downloads a cross-compilation toolchain, downloads the selected components and their dependencies, compiles and installs everything into the chosen filesystem. In this talk, a concrete case study shows how this simplifies the development process. This talk shows how buildroot helps you to bring up a basic working system in less than a day, so that you can concentrate on developing your application.