As people might have seen, I already had a go (and was successful) at building Luxrays/luxrender on an ARM system. Since the Raspberry Pi is getting close to shipping, and I am eagerly awaiting mine, I compiled luxrays and luxrender on the official debian SD card image emulated in QEMU. In principle anyone who does this will be able to use the image (with compiled lux) and put it straight into the Pi when it arrives.
I wrote this on my wordpress blog, I wonder if I might put it up on the wiki?
The guide borrows heavily from the wiki and other guides for building on ubuntu, so apologies for copying, though in this case a step by step guide was required. http://3drenderblog.wordpress.com/2012/ ... pberry-pi/