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