Howto build and install LMS 7.8 / 7.9 for FreeNAS 9.2.1.6 from scratch

Hi,

I've been reading silently for some time now, and felt like this information might be helpful to someone...

I've set up FreeNAS-9.2.1.6-RELEASE-x64 (ddd1e39) on a HP Proliant Microserver Gen8 and have as evidently many others been struggling with Squeezebox LMS.

I have absolutely no experience with FreeNAS but used to have quite enough experience with FreeBSD during the 2.x - 4.x releases.
So please feel free to comment on all the DON'Ts I did...

Howto build and install LMS 7.8 / 7.9 for FreeNAS 9.2.1.6 from scratch