Q
clang: error: unable to find utility "clang", not a developer tool or in PATH
git: error: unable to find utility "git", not a developer tool or in PATH
A
xcode-select的位置错误，需要修改指向的位置：
$ xcode-select --print-path
/Applications/Xcode.app/Contents/Developer
# 修改xcode-select的位置
$ sudo xcode-select --switch /Library/Developer/CommandLineTools
# 再次运行brew命令即可正常运行