hm, no worries at least on my machine. I knew about /usr/local problem from Yosemite, though on El Capitan (same time as Yosemite, with /usr/local moved to ~/l

hm, no worries at least on my machine. I knew about /usr/local problem from Yosemite, though on El Capitan (same time as Yosemite, with /usr/local moved to ~/local) it was smooth as butter (I did not move /usr/local). All upgrade took about 30 minutes, and after it was done, I did sudo chown -R $(whoami):admin /usr/local and I was good to go.