Genode OS is one of the early non-Linux operating systems that ported Gallium3D and GEM for its graphics drivers, provided a Gallium3D LiveCD, and then grew ambitions to become a general purpose OS. In its latest release it was ported to ARM and picked up other features, but now it's been even more improved.
With the release of Genode OS Framework 12.11, the operating system is now self-hosting so that it doesn't need to be compiled from a non-Genode host. An unmodified Genode build system can now be executed directly on Genode running on a micr-kernel. The build system is based upon GCC and GNU utilities.
Aside from being self-hosting, there's also a whole lot of other changes making up the Genode OS 12.11 release. For more release details, see Genode.org.