From owner-svn-ports-all@FreeBSD.ORG  Fri Apr 10 11:12:25 2015
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Date: Fri, 10 Apr 2015 11:12:25 +0000
From: Alexey Dokuchaev <danfe@FreeBSD.org>
To: Bartek Rutkowski <robak@FreeBSD.org>
Subject: Re: svn commit: r383718 - head/devel/libtool
Message-ID: <20150410111225.GA51618@FreeBSD.org>
References: <201504101110.t3ABAxuc032873@svn.freebsd.org>
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On Fri, Apr 10, 2015 at 11:10:59AM +0000, Bartek Rutkowski wrote:
> New Revision: 383718
> URL: https://svnweb.freebsd.org/changeset/ports/383718
> 
> Log:
>   devel/libtool: add CPE information
> [...]
> -USES+=		makeinfo
> +USES+=		cpe makeinfo

Can you elaborate a bit on why += is necessary here (and other similar
commits)?

./danfe