--- kernel-2.6.27.orig/drivers/usb/core/Makefile
+++ kernel-2.6.27/drivers/usb/core/Makefile
@@ -6,6 +6,10 @@
 			config.o file.o buffer.o sysfs.o endpoint.o \
 			devio.o notify.o generic.o quirks.o
 
+ifeq ($(CONFIG_USB_OTG),y)
+	usbcore-objs	+= otg.o
+endif
+
 ifeq ($(CONFIG_PCI),y)
 	usbcore-objs	+= hcd-pci.o
 endif