--- src/VBox/Makefile.kmk.orig	2020-07-10 02:57:19.000000000 +1000
+++ src/VBox/Makefile.kmk	2020-08-21 16:57:08.142306000 +1000
@@ -22,7 +22,7 @@
 ifdef VBOX_ONLY_ADDITIONS
  include $(PATH_SUB_CURRENT)/Runtime/Makefile.kmk
  if defined(VBOX_WITH_CROGL) || defined(VBOX_WITH_HGSMI)
-  if1of ($(KBUILD_TARGET),win linux solaris freebsd netbsd haiku)
+  if1of ($(KBUILD_TARGET),win linux solaris bsdsunix freebsd netbsd haiku)
    include $(PATH_SUB_CURRENT)/GuestHost/Makefile.kmk
   endif
  endif