Cross-compile for RPi2 on OS X 10.10.5

I have a Mac Pro Dual Quad Core 2.66 Ghz running Yosemite (OS X 10.10.5) and an
RPi2 with Raspbian 4.9.17-v7+ #981 and Kodi 15.2.
VBox is installed on my Mac and I can setup Ubuntu if needed.

I would like to build Kodi 17.1 for the RPi2.
I am aware that Ubuntu is the preferred OS but there is a learning curve.
Also if desperate I guess I could build on the RPI2 also a learning curve.

But has anyone cross compiled on OS X for RPi2?

Advice would be appreciated as smartest way to proceed.

TIA