brew出现"Error: /usr/local must be writable!"错误

解决方法
sudo chown -R $(whoami) /usr/local

例:

MarydeiMac:~ mary$ brew update
Error: /usr/local must be writable!
MarydeiMac:~ mary$ sudo chown -R $(whoami) /usr/local
chown: /usr/local: Operation not permitted

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