From owner-freebsd-questions@FreeBSD.ORG  Thu Mar 22 19:06:04 2007
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From: Chuck Swiger <cswiger@mac.com>
Date: Thu, 22 Mar 2007 12:06:02 -0700
To: White Hat <pigskin_referee@yahoo.com>
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Cc: FreeBSD Users Questions <freebsd-questions@freebsd.org>
Subject: Re: Updating GCC
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On Mar 22, 2007, at 11:55 AM, White Hat wrote:
> The installed version is gcc-3.4.6, while the ports
> have version 4.3.0 available. If I install the newer
> version will it replace the older version?

Nope.

> If not and I don't think it will, how do I force the use of the
> newer version of Gcc when making a port?

Add:

CC?=	/usr/local/bin/gcc
CXX?=	/usr/local/bin/g++

...to /etc/make.conf.  You might also find looking at /usr/ports/Mk/ 
bsd.gcc.mk to be informative...

-- 
-Chuck