--- src/VBox/Additions/x11/Makefile.kmk.orig	2020-07-10 02:50:14.000000000 +1000
+++ src/VBox/Additions/x11/Makefile.kmk	2020-08-22 15:51:13.126628000 +1000
@@ -19,7 +19,7 @@
 include $(KBUILD_PATH)/subheader.kmk
 
 # Include sub-makefiles.
-if1of ($(KBUILD_TARGET), freebsd linux netbsd openbsd solaris)
+if1of ($(KBUILD_TARGET), bsdsunix freebsd linux netbsd openbsd solaris)
  include $(PATH_SUB_CURRENT)/VBoxClient/Makefile.kmk
  ifndef VBOX_NO_LEGACY_XORG_X11
   include $(PATH_SUB_CURRENT)/vboxvideo/Makefile.kmk