--- src/VBox/Additions/bsdsunix/Makefile.orig	2020-08-17 13:23:45.000000000 +1000
+++ src/VBox/Additions/bsdsunix/Makefile	2020-08-23 02:06:22.158536000 +1000
@@ -0,0 +1,66 @@
+#
+# Makefile for the VirtualBox BSDSUniX Guest Drivers.
+#
+
+#
+# Copyright (C) 2009-2017 Oracle Corporation
+#
+# This file is part of VirtualBox Open Source Edition (OSE), as
+# available from http://www.virtualbox.org. This file is free software;
+# you can redistribute it and/or modify it under the terms of the GNU
+# General Public License (GPL) as published by the Free Software
+# Foundation, in version 2 as it comes in the "COPYING" file of the
+# VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+# hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+#
+
+KBUILD_VERBOSE =
+
+all:
+	@echo "=== Building 'vboxguest' module ==="
+	@$(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxguest
+	@if [ -f vboxguest/vboxguest.ko ]; then \
+	    cp vboxguest/vboxguest.ko .; \
+	 fi
+	@echo
+	@if [ -d vboxvfs ]; then \
+	    echo "=== Building 'vboxvfs' module ==="; \
+	    $(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxvfs; \
+	    if [ -f vboxvfs/vboxvfs.ko ]; then \
+	        cp vboxvfs/vboxvfs.ko .; \
+	    fi; \
+	fi
+	@echo
+	@if [ -d mount_vboxvfs ]; then \
+	    echo "=== Building mount_vboxvfs binary ==="; \
+	    $(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C  mount_vboxvfs clean obj depend all; \
+	    if [ -f mount_vboxvfs ]; then \
+	        cp mount_vboxvfs/mount_vboxvfs .; \
+	    fi; \
+	fi
+
+
+install:
+	@$(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxguest install
+	@if [ -d vboxvfs ]; then \
+	    $(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxvfs install; \
+	fi
+	@if [ -d mount_vboxvfs ]; then \
+	    $(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C mount_vboxvfs install; \
+	fi
+
+clean:
+	@$(MAKE) -C vboxguest clean
+	@if [ -d vboxvfs ]; then \
+	    $(MAKE) -C vboxvfs clean; \
+	fi
+	@if [ -d mount_vboxvfs ]; then \
+	    $(MAKE) -C mount_vboxvfs clean; \
+	fi
+	rm -f vboxguest.*o vboxvfs.*o mount_vboxvfs
+
+load:
+	@/sbin/kldunload vboxvfs || true
+	@/sbin/kldunload vboxguest || true
+	@/sbin/kldload ./vboxguest.ko
+	@if [ -f vboxvfs.ko ]; then /sbin/kldload ./vboxvfs.ko; fi