Copyright (c) 2016 Sérgio Basto

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The MIT License is to allow be in included in VirtualBox source code.

Using also VBOX_USE_SYSTEM_XORG_HEADERS to build guest additions parts,
just compile with X11 system source and we may remove all bundle X11 source code.

when we use VBOX_USE_SYSTEM_XORG_HEADERS, we don't need compile the very old
VBoxGuestR3LibXFree86 for use with old servers where the C library is not
available and becasue fail to build when we unbundle all X11 sources, files like
xf86_ansic.h doesn't exist anymore.

--- ./src/VBox/Additions/common/VBoxGuest/lib/Makefile.kmk.orig	2014-10-11 13:03:35.000000000 +0100
+++ ./src/VBox/Additions/common/VBoxGuest/lib/Makefile.kmk	2014-10-12 00:11:00.925507543 +0100
@@ -40,9 +40,11 @@ LIBRARIES += \
 	VBoxGuestR3LibShared
 ifndef VBOX_ONLY_VALIDATIONKIT
  if1of ($(KBUILD_TARGET), freebsd linux netbsd openbsd)
+ ifndef VBOX_USE_SYSTEM_XORG_HEADERS
   LIBRARIES += \
   	VBoxGuestR3LibXFree86
  endif
+ endif
  if1of ($(KBUILD_TARGET), freebsd linux netbsd openbsd solaris)
   LIBRARIES += \
   	VBoxGuestR3LibXOrg