From owner-freebsd-ports@FreeBSD.ORG  Mon May 13 17:43:10 2013
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From: Chris Rees <crees@FreeBSD.org>
Date: Mon, 13 May 2013 18:42:40 +0100
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Subject: Re: Adding a C++11 based port
To: David Demelier <demelier.david@gmail.com>
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On 13 May 2013 16:14, David Demelier <demelier.david@gmail.com> wrote:
> Hello dear,
>
> I plan to release an application I wrote very soon. If possible I want
> to add a port for it. One problem is that I've used C++11 and this is
> part of system only if users have compiled world with the new C++
> stack.
>
> Should I wait until 9.2-RELEASE before requesting that new port? Or is
> C++11 only for FreeBSD 10?

If it builds and works with gcc46, you can probably do something like

.include <bsd.port.options.mk>

.if ${OSVERSION} < xxxx # before clang was around
USE_GCC= 46+
.endif

Chris