Emdebian Toolchain Autobuilder
Emdebian Toolchain Autobuilder is in a very inmature stage, so be carefull.
[http://www.emdebian.org/repos/current/emdebian/trunk/paamboli/trunk/ paamboli] and [http://www.emdebian.org/repos/current/emdebian/trunk/buildcross/trunk/ buildcross] work together to provide a distributed building system for the cross toolchains that Emdebian provides.
Paamboli has a separated set of scripts named pernil, tomata, pa and oli. It keeps in mind distributed buildings relaying on secure keys, with the master and slave point of view.
Oli is the master script and it is meant to be run on the master system, and basically what it does is to send tomata to the slave system (which have been already configured with pa and a rootfs tarball) and tomata triggers pernil script which it is encharged to set up the build environment and produce the binaries, afterwards those get send to the master and included into the public repository.
You need to create a tarball with a rootfs. Setup pa as a cron task.