问题 mac升级到10.12(macOS Sierra),执行命令,出现如下错误: xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun 解决办法 安装xcode-select # xcode-select --install 跳出对话框,安装即可.…