Brew or Homebrew kept erroring out on MacOS with El Capitan – turns out it had to do with security feature called SIP = Security integrity protection which prevents changes to the /System, /Usr and /sbin directory.
You can disable it by running – “csrutil disable” command.
For homebrew to work
$ sudo chown -R $(whoami):admin /usr/local If it still doesn’t work, use following steps
1. open terminal
2. $ cd /usr/local
3. $ git reset --hard
4. $ git clean -df
5. $ brew update
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