FreeBSD 6.2 ./configure plays oddly when building 8.2.2 from tarball

I'm trying to build PostgreSQL 8.2.2 outside the ports system on a
FreeBSD 6.2 amd64 box. The databases/postgresql81-server port builds
8.1.7 just fine on the same box. My configure fails. I'm new to
FreeBSD so I expect I'm missing something pretty obvious. config.log
follows. Line 2212 is very odd since it appears to be giving gcc the
library prefix as a file name.

This file contains any messages produced by compilers while
running configure, to aid debugging if configure makes a mistake.

It was created by PostgreSQL configure 8.2.2, which was
generated by GNU Autoconf 2.59. Invocation command line was

$ ./configure --prefix=/usr/local/pgsql822_sl126_amd64_FreeBSD62
--with-includes=/usr/local/include --with-libs=/usr/local/lib
--enable-thread-saftey --with-openssl --enable-debug CC=gcc CFLAGS=-O3
-funroll-loops -m64

## --------- ##
## Platform. ##
## --------- ##

hostname = ahammond.ecoffice.experclick.com
uname -m = amd64
uname -r = 6.2-RELEASE
uname -s = FreeBSD
uname -v = FreeBSD 6.2-RELEASE #0: Fri Jan 12 08:43:30 UTC 2007
root(at)portnoy(dot)cse(dot)buffalo(dot)edu:/usr/obj/usr/src/sys/SMP

/usr/bin/uname -p = amd64
/bin/uname -X = unknown

/bin/arch = unknown
/usr/bin/arch -k = unknown
/usr/convex/getsysinfo = unknown
hostinfo = unknown
/bin/machine = unknown
/usr/bin/oslevel = unknown
/bin/universe = unknown

PATH: /sbin
PATH: /bin
PATH: /usr/sbin
PATH: /usr/bin
PATH: /usr/games
PATH: /usr/local/sbin
PATH: /usr/local/bin
PATH: /usr/X11R6/bin
PATH: /home/ahammond/bin

## ----------- ##
## Core tests. ##
## ----------- ##

configure:1408: checking build system type
configure:1426: result: x86_64-unknown-freebsd6.2
configure:1434: checking host system type
configure:1448: result: x86_64-unknown-freebsd6.2
configure:1458: checking which template to use
configure:1558: result: freebsd
configure:1700: checking whether to build with 64-bit integer date/time support
configure:1732: result: no
configure:1739: checking whether NLS is wanted
configure:1774: result: no
configure:1782: checking for default port number
configure:1812: result: 5432
configure:2170: checking for C compiler version
configure:2173: gcc --version </dev/null >&5
gcc (GCC) 3.4.6 [FreeBSD] 20060305
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

configure:2176: $? = 0
configure:2178: gcc -v </dev/null >&5
Using built-in specs.
Configured with: FreeBSD/amd64 system compiler
Thread model: posix
gcc version 3.4.6 [FreeBSD] 20060305
configure:2181: $? = 0
configure:2183: gcc -V </dev/null >&5
gcc: `-V' option must have argument
configure:2186: $? = 1
configure:2209: checking for C compiler default output file name
configure:2212: gcc -O3 -funroll-loops -m64 conftest.c /usr/local/lib >&5
/usr/local/lib: file not recognized: File format not recognized
configure:2215: $? = 1