Installing on Snow Leopard

It seems that the install process tries to build a 32-bit driver on
Snow Leopard which is as far as I know, a 64-bit system.  How do I get
a 64-bit driver?

My installation on Snow Leopard ends with

 sudo python setup.py install
running install
running build
running build_py
running build_ext
building 'psycopg2._psycopg' extension
gcc -arch ppc -arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk
-fno-strict-aliasing -Wno-long-double -no-cpp-precomp -mno-fused-madd
-fno-common -dynamic -DNDEBUG -g -O3 -DPSYCOPG_DEFAULT_PYDATETIME=1
-DPSYCOPG_VERSION="2.0.14 (dt dec ext pq3)" -DPG_VERSION_HEX=0x080403
-DPSYCOPG_EXTENSIONS=1 -DPSYCOPG_NEW_BOOLEAN=1 -DHAVE_PQFREEMEM=1
-DHAVE_PQPROTOCOL3=1
-I/Library/Frameworks/Python.framework/Versions/2.5/include/python2.5
-I. -I/Library/PostgreSQL/8.4/include
-I/Library/PostgreSQL/8.4/include/postgresql/server -c
psycopg/psycopgmodule.c -o
build/temp.macosx-10.3-i386-2.5/psycopg/psycopgmodule.o
cc1: error: unrecognized command line option "-Wno-long-double"
cc1: error: unrecognized command line option "-Wno-long-double"
lipo: can't figure out the architecture type of: /var/tmp//ccmP38pg.out
error: command 'gcc' failed with exit status 1

Regards
Johann

-- 
"Finally, brethren, whatsoever things are true,  whatsoever things are
honest, whatsoever things are  just, whatsoever things are pure,
whatsoever things are lovely, whatsoever things are of good report; if
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things."    Philippians 4:8