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A build system is a set of tools, source trees, Makefiles, patches, configuration files and scripts that make it easy to generate all the components of a complete embedded Linux system. A build system, once properly set up, automates the configuration and cross-compilation processes, generating all the required targets (userspace packages such as libraries and programs, the o.s. kernel, the bootloader and root filesystem images) depending on the configuration. In particular, using an integrated build system prevents from problems caused by misaligned toolchains, since a unique toolchain is used to build all the software components, including the customer application. Some well known structured build systems are the following:

*OpenEmbedded (http://wiki.openembedded.net/index.php/Main_Page)

*For linux: <code>git checkout bora</code>

Once these steps are completed, <u>don't forget to update the repositories</u>, as described in [[#U-Boot and Linux git repositories|this section]].