@bulsa: Amazon's source code packages. Unlike Kobo's, their mxcfb headers are actually usually fairly sane

. Might have lucked out on the exact version I chose at the time though ;p.
Note that this version of the header is fairly strongly aimed at userland, some stuff has been renamed, and it's generally an agglomeration of a couple of different versions of the header in order to cover all the 5.x range of FW & devices.