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			On all of the machines I have upgraded to OS X El Capitan, my /usr/local directory has changed ownership. Since this message shows up as an error during `brew update`, I figured it would be good to beef up the explanation. Closes Homebrew/homebrew#44670. Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
Homebrew's Formula API
This is the (partially) documented public API for Homebrew.
The main class you should look at is the {Formula} class (and classes linked from there). That's the class that's used to create Homebrew formulae (i.e. package descriptions). Assume anything else you stumble upon is private.
You may also find the Formula Cookbook and Ruby Style Guide helpful in creating formulae.
Good luck!