Updating /usr/src after updating 4.7->4.8

[Paul Hoffman]

Greetings again. On a test machine, I upgraded from fairly vanilla 
4.7 to 4.8 using CD-ROM and /stand/sysintall. At the beginning of the 
upgrade, it told me that it would not upgrade /usr/src. After the 
upgrade, I see by the dates that it upgraded some of /usr/src, but 
not most of it.

What is the proper way to bring /usr/src up to date so that I can 
make kernel mods?

--Paul Hoffman