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Date: Mon, 17 Nov 2014 11:02:53 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: RW <rwmaillists@googlemail.com>
Subject: Re: Deleting ports distfiles
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On Mon, 17 Nov 2014, RW wrote:

> portupgrade's portsclean utility and distviper (from
> sysutils/bsdadminscripts) can do it more flexibly.
>
> portmaster removes any files not associated with currently installed
> packages, the other two do can do that, but also have the option to
> leave any files that are still up-to-date with respect to the ports
> tree.

Actually, portmaster can do that also:
portmaster -t -y --clean-distfiles