用国内镜像源

步骤一

cd “$(brew --repo)”
git remote set-url origin https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/brew.git

步骤二

cd “$(brew --repo)/Library/Taps/homebrew/homebrew-core”
git remote set-url origin https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/homebrew-core.git

#步骤三
brew update

复原
cd “$(brew --repo)”
git remote set-url origin https://github.com/Homebrew/brew.git

cd “$(brew --repo)/Library/Taps/homebrew/homebrew-core”
git remote set-url origin https://github.com/Homebrew/homebrew-core

brew update
转载：https://www.uedbox.com/post/57246/