LO needs to build both against MacOSX SDK and not produce universal binaries.

diff -ru python3.old_/configure python3/configure
--- python3.old_/configure	2012-09-29 10:00:50.000000000 +0200
+++ python3/configure	2012-11-13 16:37:26.030013256 +0100
@@ -6353,7 +6353,19 @@
 	    if test "${enable_universalsdk}"; then
 		UNIVERSAL_ARCH_FLAGS=""
 	        if test "$UNIVERSAL_ARCHS" = "32-bit" ; then
-		   UNIVERSAL_ARCH_FLAGS="-arch ppc -arch i386"
+           # LO does not use Universal Binaries (but the only way to set a SDK
+           # here implies that, so de-universalize here...)
+           case `/usr/bin/arch` in
+           i386)
+               UNIVERSAL_ARCH_FLAGS="-arch i386"
+               ;;
+           ppc)
+               UNIVERSAL_ARCH_FLAGS="-arch ppc"
+               ;;
+           *)
+               as_fn_error $? "Unexpected output of 'arch' on OSX" "$LINENO" 5
+               ;;
+           esac
 		   ARCH_RUN_32BIT=""
 		   LIPO_32BIT_FLAGS=""
 	         elif test "$UNIVERSAL_ARCHS" = "64-bit" ; then
