Brew 是OS X 上類似apt-get以及yum的一個軟件包管理器，它依托於Github………………
所以，雖然你僥幸下載到了 brew，但你肯定是無法更新 brew 的。原因你懂。不過雖然不能更新 brew，但這只是指brew這個管理器本身罷了，軟件還是可以安裝的。但由於無法使用 brew update 也就無法更新軟件……我們有必要來給 brew 換源。
安裝、卸載homebrew
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/uninstall)" sudo rm -rf /usr/local/
替換homebrew默認源
cd /usr/local git remote set-url origin git://mirrors.ustc.edu.cn/brew.git
替換homebrew-core默認源
cd /usr/local/Library/Taps/homebrew/homebrew-core git remote set-url origin git://mirrors.ustc.edu.cn/homebrew-core.git
替換homebrew-cask默認源
cd /usr/local/Homebrew/Library/Taps/caskroom/homebrew-cask git remote set-url origin git://mirrors.ustc.edu.cn/homebrew-cask.git
替換homebrew bottles默認源
echo 'export HOMEBREW_BOTTLE_DOMAIN=https://mirrors.ustc.edu.cn/homebrew-bottles' >> ~/.bashrc sourch ~/.bashrc
PS:
https://servers.ustclug.org/2016/01/mirrors-add-homebrew-bottles-source/
https://www.logcg.com/archives/1301.html
https://mirrors.tuna.tsinghua.edu.cn/help/homebrew/
https://mirrors.tuna.tsinghua.edu.cn/help/homebrew-bottles/
https://lug.ustc.edu.cn/wiki/mirrors/help/homebrew-bottles