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https://www.peterdavehello.org/2013/12/%e7%94%a8portmaster%e5%8d%87%e7%b4%9a%e5%b7%b2%e7%b6%93%e5%ae%89%e8%a3%9d%e7%9a%84freebsd-ports%e5%a5%97%e4%bb%b6/
用 Portmaster 升級已經安裝的 FreeBSD 套件