Index: /trunk/Config.kmk
===================================================================
--- /trunk/Config.kmk	(revision 86641)
+++ /trunk/Config.kmk	(revision 86642)
@@ -424,4 +424,6 @@
 # Enable the debugger GUI.
 VBOX_WITH_DEBUGGER_GUI = 1
+# Enables the third step using IEM (the interpreter).
+VBOX_WITH_3RD_IEM_STEP = 1
 # Nested hardware virtualization (64-bit hosts only).
 ifeq ($(KBUILD_TARGET_ARCH),amd64)
Index: /trunk/src/VBox/VMM/Config.kmk
===================================================================
--- /trunk/src/VBox/VMM/Config.kmk	(revision 86641)
+++ /trunk/src/VBox/VMM/Config.kmk	(revision 86642)
@@ -30,4 +30,7 @@
 # Can be prepended to by setting it in LocalConfig.kmk
 VMM_COMMON_DEFS := USING_VMM_COMMON_DEFS
+ifdef VBOX_WITH_3RD_IEM_STEP
+ VMM_COMMON_DEFS += VBOX_WITH_3RD_IEM_STEP
+endif
 ifdef VBOX_WITH_NESTED_HWVIRT_SVM
  VMM_COMMON_DEFS += VBOX_WITH_NESTED_HWVIRT_SVM