+ifdef Build/Prepare/$(ARCH)
+define Build/Prepare
+ $(call Build/Prepare/$(ARCH))
+endef
+else
+define Build/Prepare
+ $(call Kernel/Prepare/Default)
+ $(SED) 's/@expr length/@-expr length/' $(PKG_BUILD_DIR)/Makefile
+ ln -sf $(PKG_BUILD_DIR) $(LINUX_HEADERS_DIR)
+endef
+endif
+