Index: /trunk/Config.kmk
===================================================================
--- /trunk/Config.kmk	(revision 53984)
+++ /trunk/Config.kmk	(revision 53985)
@@ -2430,4 +2430,5 @@
 	$(QUIET)$(APPEND) '$@' 'VBOX_GCC_Wno-variadic-macros   ?= $(call VBOX_GCC_CHECK_CXX,-Wno-variadic-macros,)'
 	$(QUIET)$(APPEND) '$@' 'VBOX_GCC_Wno-vla               ?= $(call VBOX_GCC_CHECK_CXX,-Wno-vla,)'
+	$(QUIET)$(APPEND) '$@' 'VBOX_GCC_Wno-overlength-strings?= $(call VBOX_GCC_CHECK_CC,-Wno-overlength-strings,)'
 	$(QUIET)$(APPEND) '$@' 'VBOX_GCC_fno-stack-protector   ?= $(call VBOX_GCC_CHECK_CC,-fno-stack-protector,)'
 	$(QUIET)$(APPEND) '$@' 'VBOX_GCC_fno-dwarf2-cfi-asm    ?= $(call VBOX_GCC_CHECK_CC,-fno-dwarf2-cfi-asm,)'
Index: /trunk/src/VBox/ExtPacks/VBoxDTrace/Makefile.kmk
===================================================================
--- /trunk/src/VBox/ExtPacks/VBoxDTrace/Makefile.kmk	(revision 53984)
+++ /trunk/src/VBox/ExtPacks/VBoxDTrace/Makefile.kmk	(revision 53985)
@@ -55,5 +55,5 @@
 
 
-ifdef VBOX_WITH_EXTPACK_VBOXDTRACE
+if defined(VBOX_WITH_EXTPACK_VBOXDTRACE) && defined(VBOX_WITH_EXTPACK)
 
  #
@@ -101,5 +101,5 @@
  VBoxDTraceCmd_SDKS = VBOX_ZLIB
  ifn1of ($(KBUILD_TARGET), win)
-  VBoxDTraceCmd_CFLAGS = -Wno-format -Wno-overlength-strings -Wno-sign-compare -Wno-strict-prototypes -Wno-missing-prototypes -Wno-missing-declarations -Wno-shadow
+  VBoxDTraceCmd_CFLAGS = -Wno-format $(VBOX_GCC_Wno-overlength-strings) -Wno-sign-compare -Wno-strict-prototypes -Wno-missing-prototypes -Wno-missing-declarations -Wno-shadow
  endif
  VBoxDTraceCmd_INCS = \