$NetBSD: patch-tools_firmware_hvmloader_Makefile,v 1.1 2018/07/24 13:40:11 bouyer Exp $

--- tools/firmware/hvmloader/Makefile.orig	2016-12-05 13:03:27.000000000 +0100
+++ tools/firmware/hvmloader/Makefile	2017-03-24 18:14:34.000000000 +0100
@@ -26,7 +26,7 @@
 # SMBIOS spec requires format mm/dd/yyyy
 SMBIOS_REL_DATE ?= $(shell date +%m/%d/%Y)
 
-CFLAGS += $(CFLAGS_xeninclude)
+CFLAGS += $(CFLAGS_xeninclude) $(EXTRA_CFLAGS)
 
 # We mustn't use tools-only public interfaces.
 CFLAGS += -D__XEN_INTERFACE_VERSION__=__XEN_LATEST_INTERFACE_VERSION__