9.0Beta2 Build on Mac (64 bit) of pg_upgrade fails with duplicate symbols

I'm building the contrib modules and get this:

gcc -no-cpp-precomp -O3 -fno-common -arch x86_64 -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels -fno-strict-aliasing -fwrapv check.o controldata.o dump.o exec.o file.o function.o info.o option.o page.o pg_upgrade.o relfilenode.o server.o tablespace.o util.o version.o version_old_8_3.o -L../../src/port -lpgport -L../../src/interfaces/libpq -lpq -L../../src/port -O3 -fno-common -arch x86_64 -Wl,-dead_strip_dylibs -lpgport -lpam -lssl -lcrypto -lgssapi_krb5 -lz -lreadline -lm -o pg_upgrade
ld: duplicate symbol _scandir_file_pattern in controldata.o and check.o

My configure script looks like:

export MACOSX_DEPLOYMENT_TARGET=10.6
export CC=gcc
export CPP="gcc -E"
export CXX=g++
export CXXFLAGS='-O3 -fno-common -arch x86_64'
export CFLAGS='-O3 -fno-common -arch x86_64'
export LDFLAGS='-O3 -fno-common -arch x86_64'

./configure \
--prefix=/usr \
--enable-integer-datetimes \
--with-tcl \
--with-perl \
--with-python \
--with-gssapi \
--with-krb5 \
--with-pam \
--with-ldap \
--with-bonjour \
--with-openssl \
--with-zlib

make of the normal sources worked.
But
cd contrib
make
resulted in the error above.

best regards,
chris
--
chris ruprecht
specialist in obscure details