--- src/VBox/Additions/bsdsunix/mount_vboxvfs/Makefile.kmk.orig	2020-08-17 13:23:45.000000000 +1000
+++ src/VBox/Additions/bsdsunix/mount_vboxvfs/Makefile.kmk	2020-08-23 02:11:11.211437000 +1000
@@ -0,0 +1,23 @@
+# $Id: Makefile.kmk $
+## @file
+# Sub-Makefile for the BSDSUniX Shared folder mount utility.
+#
+
+SUB_DEPTH = ../../../../..
+include $(KBUILD_PATH)/subheader.kmk
+
+ifneq ($(KBUILD_HOST),bsdsunix)
+$(error "The BSDSUniX guest additions can only be built on BSDSUniX!")
+endif
+
+MOUNT=		$(VBOX_BSDSUNIX_SRC)/../sbin/mount
+
+CFLAGS+=-I$(MOUNT)
+
+PROGRAMS                += mount_vboxvfs
+mount_vboxvfs_TEMPLATE    = NewVBoxGuestR3Exe
+mount_vboxvfs_SOURCES     = $(MOUNT)/getmntopts.c \
+				mount_vboxvfs.c
+
+include $(FILE_KBUILD_SUB_FOOTER)
+