--- src/VBox/ValidationKit/bootsectors/bootsector2-first.mac.orig	2020-07-10 02:58:03.000000000 +1000
+++ src/VBox/ValidationKit/bootsectors/bootsector2-first.mac	2020-08-22 00:17:13.512906000 +1000
@@ -37,6 +37,7 @@
 
  %undef RT_OS_DARWIN
  %undef RT_OS_FREEBSD
+ %undef RT_OS_BSDSUNIX
  %undef RT_OS_HAIKU
  %undef RT_OS_LINUX
  %undef RT_OS_NETBSD