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+# El Capitan & Homebrew
+
+Part of the OS X 10.11/El Capitan changes is something called [System Integrity Protection](https://en.wikipedia.org/wiki/System_Integrity_Protection) or "SIP".
+
+SIP prevents you from writing to many system directories such as `/usr`, `/System` & `/bin`, regardless of whether or not you are root. The Apple keynote is [here](https://developer.apple.com/videos/wwdc/2015/?id=706) if you'd like to learn more.
+
+One of the implications of SIP is that you cannot simply create `/usr/local` if it is removed or doesn't exist for another reason. However, as noted in the keynote, Apple is leaving `/usr/local` open for developers to use, so Homebrew can still be used as expected.
+
+Apple documentation hints that `/usr/local` will be returned to `root:wheel restricted` permissions on [every OS X update](https://developer.apple.com/library/prerelease/mac/releasenotes/General/rn-osx-10.11/); Homebrew will be adding a `brew doctor` check to warn you when this happens in the near future.
+
+If you haven't installed Homebrew in `/usr/local` or another system-protected directory, none of these concerns apply to you.
+
+This is how to fix Homebrew on El Capitan if you see permission issues:
+
+## If `/usr/local` exists already:
+
+```bash
+sudo chown $(whoami):admin /usr/local && sudo chown -R $(whoami):admin /usr/local
+```
+
+## If `/usr/local` does not exist:
+
+* Reboot into Recovery mode (Hold Cmd+R on boot) & access the Terminal.
+* In that terminal run:
+    `csrutil disable`
+* Reboot back into OS X
+* Open your Terminal application and execute:
+
+```bash
+  sudo mkdir /usr/local && sudo chflags norestricted /usr/local && sudo chown $(whoami):admin /usr/local && sudo chown -R $(whoami):admin /usr/local
+```
+
+* Reboot back into Recovery Mode & access the Terminal again.
+* In that terminal execute:
+  `csrutil enable`
+* Reboot back into OS X & you'll be able to write to `/usr/local` & install Homebrew.