1. Install Xcode and the Xcode Command Line Tools
2. Agree to Xcode license in Terminal: sudo xcodebuild -license
3. Install MacPorts for your version of OS X:

下载地址：https://www.macports.org/install.php

安装后记得重启终端，否则会提示port命令找不到。

更新命令：

sudo port -v selfupdate

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