[rbinv]

https://github.com/Homebrew/homebrew/blob/master/share/doc/h...

"Apple documentation hints that /usr/local will be returned to root:wheel restricted permissions on every OS X update; Homebrew will be adding a brew doctor check to warn you when this happens in the near future."

[crazysim]

Perhaps they should consider adding an option to install something into launchd that just does this.