define Build/Configure/U-Boot
+$(MAKE) $(PKG_JOBS) -C $(PKG_BUILD_DIR) $(UBOOT_CONFIGURE_VARS) $(UBOOT_CONFIG)_config
+ $(if $(strip $(UBOOT_CUSTOMIZE_CONFIG)),
+ $(PKG_BUILD_DIR)/scripts/config --file $(PKG_BUILD_DIR)/.config $(UBOOT_CUSTOMIZE_CONFIG)
+ +$(MAKE) $(PKG_JOBS) -C $(PKG_BUILD_DIR) $(UBOOT_CONFIGURE_VARS) oldconfig)
endef
DTC=$(wildcard $(LINUX_DIR)/scripts/dtc/dtc)