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Date: Mon, 30 Mar 2015 15:13:56 +0200
From: Mathieu Arnold <mat@FreeBSD.org>
To: Daniel Eischen <deischen@freebsd.org>, freebsd-ports@freebsd.org
Subject: Re: USES vs BUILD_DEPENDS
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+--On 29 mars 2015 12:41:21 -0400 Daniel Eischen <deischen@freebsd.org>
wrote:
| I have a port which needs pod2man just to build the man file
| during installation.  Why do I need USES= pod2man:perl5 just to
| build the port?  It doesn't seem feasible to use BUILD_DEPENDS
| because there is no generic perl5 port.

You need:
USES=perl5
USE_PERL5=build

Because that's the right way to say you need Perl to build your port.

-- 
Mathieu Arnold