Index: /trunk/Config.kmk
===================================================================
--- /trunk/Config.kmk	(revision 42305)
+++ /trunk/Config.kmk	(revision 42306)
@@ -1812,4 +1812,13 @@
  PATH_TOOL_YASM ?= $(PATH_DEVTOOLS_BLD)/bin
 endif
+
+# The Microsoft IDL compiler (the SDK build needs this on non-Windows).
+VBOX_WIN_MIDL ?= $(EXEC_X86_WIN32) $(call VBOX_FN_MAKE_WIN_PATH,$(firstword $(wildcard \
+	$(PATH_SDK_$(VBOX_WINPSDK)_BIN)/[Mm][Ii][Dd][Ll].[Ee][Xx][Ee]\
+	$(PATH_SDK_$(VBOX_WINPSDK))/[Bb][Ii][Nn]/[Mm][Ii][Dd][Ll].[Ee][Xx][Ee]\
+	$(PATH_SDK_WINPSDK_BIN)/[Mm][Ii][Dd][Ll].[Ee][Xx][Ee]\
+	$(PATH_SDK_WINPSDK)/[Bb][Ii][Nn]/[Mm][Ii][Dd][Ll].[Ee][Xx][Ee]\
+	$(PATH_DEVTOOLS)/win.x86/bin/[Mm][Ii][Dd][Ll].[Ee][Xx][Ee]\
+	) Sorry_Cannot_Find_The_Midl_Compiler_In_The_PSDK))
 
 # XPCOM setup for all but win32.
Index: /trunk/src/VBox/HostDrivers/VBoxNetFlt/Makefile.kmk
===================================================================
--- /trunk/src/VBox/HostDrivers/VBoxNetFlt/Makefile.kmk	(revision 42305)
+++ /trunk/src/VBox/HostDrivers/VBoxNetFlt/Makefile.kmk	(revision 42306)
@@ -237,10 +237,4 @@
  VBoxNetFltNobj_CLEAN      = $(VBoxNetFltNobj_DEPS)
 
- VBOXNETFLT_NOBJ_IDL      ?= $(EXEC_X86_WIN32) $(call VBOX_FN_MAKE_WIN_PATH,$(firstword $(wildcard \
- 	$(PATH_SDK_$(VBOX_WINPSDK)_BIN)/Midl.Exe\
- 	$(PATH_SDK_$(VBOX_WINPSDK))/Bin/Midl.Exe\
- 	$(PATH_DEVTOOLS)/win.x86/bin/midl.exe\
- 	) Sorry_Cannot_Find_The_Midl_Compiler_In_The_PSDK))
-
 $$(VBoxNetFltNobj_0_OUTDIR)/VBoxNetFltNobjT_i.c \
 + $$(VBoxNetFltNobj_0_OUTDIR)/VBoxNetFltNobjT_p.c \
@@ -250,5 +244,5 @@
 		$(PATH_SUB_CURRENT)/win/nobj/VBoxNetFltNobjT.idl \
 		| $$(dir $$@)
-	$(VBOXNETFLT_NOBJ_IDL) /nologo \
+	$(VBOX_WIN_MIDL) /nologo \
 		/out $(call VBOX_FN_MAKE_WIN_PATH,$(VBoxNetFltNobj_0_OUTDIR)) \
 		/cpp_cmd $(subst $(EXEC_X86_WIN32),,$(call VBOX_FN_MAKE_WIN_PATH,$(TOOL_$(VBOX_VCC_TOOL)_CC))) \
Index: /trunk/src/VBox/Main/Makefile.kmk
===================================================================
--- /trunk/src/VBox/Main/Makefile.kmk	(revision 42305)
+++ /trunk/src/VBox/Main/Makefile.kmk	(revision 42306)
@@ -793,14 +793,4 @@
 	$(QUIET)$(VBOX_XPIDL_ENV)$(VBOX_XPIDL) -m header  -I $(VBOX_PATH_XPCOM_IDL) -e $@ $<
 
-
-VBOX_MAIN_IDL ?= $(EXEC_X86_WIN32) $(call VBOX_FN_MAKE_WIN_PATH,$(firstword $(wildcard \
-	$(PATH_SDK_$(VBOX_WINPSDK)_BIN)/[Mm][Ii][Dd][Ll].[Ee][Xx][Ee]\
-	$(PATH_SDK_$(VBOX_WINPSDK))/[Bb][Ii][Nn]/[Mm][Ii][Dd][Ll].[Ee][Xx][Ee]\
-	$(PATH_SDK_WINPSDK_BIN)/[Mm][Ii][Dd][Ll].[Ee][Xx][Ee]\
-	$(PATH_SDK_WINPSDK)/[Bb][Ii][Nn]/[Mm][Ii][Dd][Ll].[Ee][Xx][Ee]\
-	$(PATH_DEVTOOLS)/win.x86/bin/[Mm][Ii][Dd][Ll].[Ee][Xx][Ee]\
-	) Sorry_Cannot_Find_The_Midl_Compiler_In_The_PSDK))
-IDL_DEFS = /nologo
-
 $(VBOX_IDL_FILE.MSCOM): $(VBOX_PATH_MAIN_SRC)/idl/midl.xsl $(VBOX_XIDL_FILE) | $$(dir $$@)
 	$(call MSG_TOOL,xsltproc,VBoxSVC,$<,$@)
@@ -819,5 +809,5 @@
 + $(VBoxCOM_0_OUTDIR)/VirtualBox.h \
 + $(VBoxCOM_0_OUTDIR)/VirtualBox.tlb: $(VBOX_IDL_FILE.MSCOM) | $$(dir $$@)
-	$(VBOX_MAIN_IDL) $(IDL_DEFS) \
+	$(VBOX_WIN_MIDL) /nologo \
 		/out $(call VBOX_FN_MAKE_WIN_PATH,$(VBoxCOM_0_OUTDIR)) \
 		/cpp_cmd $(subst $(EXEC_X86_WIN32),,$(call VBOX_FN_MAKE_WIN_PATH,$(TOOL_$(VBOX_VCC_TOOL)_CC))) \