--- xen-4.2.2.orig/tools/Makefile
+++ xen-4.2.2/tools/Makefile
@@ -202,6 +202,7 @@
 		--docdir=$(PREFIX)/share/doc \
 		--sysconfdir=/etc/qemu \
 		--disable-kvm \
+		--enable-vnc-ws \
 		--python=$(PYTHON) \
 		$(IOEMU_CONFIGURE_CROSS); \
 	$(MAKE) all