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In Python 2.7b1, building on OSX 10.6 with this configure command:
export CC=gcc-4.0
export CXX=g++-4.0
export MACOSX_DEPLOYMENT_TARGET=10.4
../configure \
	--with-universal-archs=32-bit \
	--enable-universalsdk=/Developer/SDKs/MacOSX10.4u.sdk \
	--enable-framework 
Results in these lines in Makefile:
BASECFLAGS=	-arch ppc -arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -fno-common -dynamic
CFLAGS=		$(BASECFLAGS) -arch ppc -arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk $(OPT) $(EXTRA_CFLAGS)
Then later on in the build the sysconfig module uses the -arch flags in CFLAGS but is not able to find a match because of the extra set of values, and the build fails with this exception:
Traceback (most recent call last):
 File "./../Lib/site.py", line 542, in <module>
 main()
 File "./../Lib/site.py", line 521, in main
 addbuilddir()
 File "./../Lib/site.py", line 118, in addbuilddir
 s = "build/lib.%s-%.3s" % (get_platform(), sys.version)
 File "/projects/Python-2.7b1/Lib/sysconfig.py", line 646, in get_platform
 "Don't know machine value for archs=%r"%(archs,))
ValueError: Don't know machine value for archs=('i386', 'i386', 'ppc', 'ppc')
make: *** [sharedmods] Error 1