NOOB Mark II development 1st ssh's : /usr/bin/xauth not found

I’ve just built my Mark II development kit and got it working. I’ve setup ssh and accessed the device but every login I get from the device:

sh: /usr/bin/xauth: not found

Should it have xauth? I assume this is going to be used to allow the MarkII to create windows on my desktop once authorized?

The device is almost exactly as delivered and very recently installed so should be up to date etc.

Thanks for any advice…