Welcome Sam Leffler <sam@FreeBSD.org> to /usr/src, /sys in particular.
Sam is quite familiar with /usr/src, but I'll let the younger ones here
figure out why. He also authored or contributed to and libtiff.

Interesting tid-bit about Sam:
He used to work at Pixar, Lucasfilm; and for a while commuted from
Berkeley to Mountain View by bicycle.

Since I'm committing this, you should assume I'm his mentor.