diff -urN a-3.4.x/configure.ac b-3.4.x/configure.ac
--- a-3.4.x/configure.ac	2012-10-21 12:46:03.203791103 +0100
+++ b-3.4.x/configure.ac	2012-10-21 12:48:08.000000000 +0100
@@ -334,6 +334,7 @@
 then
     # avoid using uname for cross builds
     if test "$cross_compiling" = yes; then
+       ac_sys_release=
        # ac_sys_system and ac_sys_release are used for setting
        # a lot of different things including 'define_xopen_source'
        # in the case statement below.
@@ -344,12 +345,32 @@
 	*-*-cygwin*)
 		ac_sys_system=Cygwin
 		;;
+	*-*-darwin*)
+		ac_sys_system=Darwin
+		ac_sys_release=$(echo $host | sed -n 's/.*-[^0-9]\+\([0-9]\+\)/\1/p')
+		if test -z "$ac_sys_release"; then
+			# A reasonable default.
+			ac_sys_release=11
+		fi
+		# Use the last released version number for old versions.
+	        if test "$ac_sys_release" = "9" ; then
+			ac_sys_release=9.8
+	        elif test "$ac_sys_release" = "10" ; then
+			ac_sys_release=10.8
+	        elif test "$ac_sys_release" = "11" ; then
+			ac_sys_release=11.4.0
+	        elif test "$ac_sys_release" = "12" ; then
+			ac_sys_release=12.0.0
+		else
+		# ..and .0.0 for unknown versions.
+			ac_sys_release=${ac_sys_release}.0.0
+		fi
+		;;
 	*)
 		# for now, limit cross builds to known configurations
 		MACHDEP="unknown"
 		AC_MSG_ERROR([cross build not supported for $host])
 	esac
-	ac_sys_release=
     else
 	ac_sys_system=`uname -s`
 	if test "$ac_sys_system" = "AIX" \
@@ -389,6 +410,9 @@
 	*-*-cygwin*)
 		_host_cpu=
 		;;
+	*-*-darwin*)
+		_host_cpu=
+		;;
 	*)
 		# for now, limit cross builds to known configurations
 		MACHDEP="unknown"
@@ -1098,6 +1122,26 @@
 
 AC_SUBST(BASECFLAGS)
 
+if test "x$cross_compiling" = xyes; then
+    function cross_arch
+    {
+        case $host in
+	  x86_64*darwin*)
+	    echo i386
+          ;;
+	  x86_64*)
+            echo x86_64
+	  ;;
+	  *)
+            echo i386
+	  ;;
+	esac
+    }
+    ARCH_PROG=cross_arch
+else
+    ARCH_PROG=/usr/bin/arch
+fi
+
 # The -arch flags for universal builds on OSX
 UNIVERSAL_ARCH_FLAGS=
 AC_SUBST(UNIVERSAL_ARCH_FLAGS)
@@ -1261,7 +1305,7 @@
 				    cur_target='10.5'
 			    fi
 		    else
-			    if test `/usr/bin/arch` = "i386"; then
+			    if test "$($ARCH_PROG)" = "i386"; then
 				    # On Intel macs default to a deployment
 				    # target of 10.4, that's the first OSX
 				    # release with Intel support.
@@ -1762,7 +1806,7 @@
     if test "${enable_universalsdk}"; then
 	    :
     else
-        LIBTOOL_CRUFT="${LIBTOOL_CRUFT} -arch_only `/usr/bin/arch`"
+        LIBTOOL_CRUFT="${LIBTOOL_CRUFT} -arch_only $($ARCH_PROG)"
     fi
     LIBTOOL_CRUFT=$LIBTOOL_CRUFT' -install_name $(PYTHONFRAMEWORKINSTALLDIR)/Versions/$(VERSION)/$(PYTHONFRAMEWORK)'
     LIBTOOL_CRUFT=$LIBTOOL_CRUFT' -compatibility_version $(VERSION) -current_version $(VERSION)';;
@@ -1787,7 +1831,7 @@
     ]])],[ac_osx_32bit=yes],[ac_osx_32bit=no],[ac_osx_32bit=yes])
     
     if test "${ac_osx_32bit}" = "yes"; then
-    	case `/usr/bin/arch` in
+    	case $($ARCH_PROG) in
     	i386) 
     		MACOSX_DEFAULT_ARCH="i386" 
     		;;
@@ -1799,7 +1843,7 @@
     		;;
     	esac
     else
-    	case `/usr/bin/arch` in
+    	case $($ARCH_PROG) in
     	i386) 
     		MACOSX_DEFAULT_ARCH="x86_64" 
     		;;