--- src/VBox/Frontends/Common/Makefile.kmk.orig	2020-07-10 02:56:32.000000000 +1000
+++ src/VBox/Frontends/Common/Makefile.kmk	2020-08-23 11:21:03.617287000 +1000
@@ -20,7 +20,7 @@
 
 # Include Sub-Makefiles
 ifneq ($(VBOX_WITH_QTGUI)$(VBOX_WITH_VBOXSDL),)
- ifeq ($(filter-out freebsd linux openbsd netbsd solaris,$(KBUILD_TARGET)),) # X11
+ ifeq ($(filter-out bsdsunix freebsd linux openbsd netbsd solaris,$(KBUILD_TARGET)),) # X11
   include $(PATH_SUB_CURRENT)/VBoxKeyboard/Makefile.kmk
  endif
 endif