Index: /trunk/src/VBox/Additions/Makefile.kmk
===================================================================
--- /trunk/src/VBox/Additions/Makefile.kmk	(revision 76193)
+++ /trunk/src/VBox/Additions/Makefile.kmk	(revision 76194)
@@ -99,5 +99,5 @@
   VBoxGuest-inf_SOURCES = \
 	$(PATH_TARGET)/VBoxGuestCat.dir/VBoxGuest.inf \
-	$(PATH_TARGET)/VBoxGuestCat.dir/VBoxGuest.cat \
+	$(if-expr defined(VBOX_SIGN_ADDITIONS),$(PATH_TARGET)/VBoxGuestCat.dir/VBoxGuest.cat,) \
 	$(PATH_TARGET)/VBoxGuestCat.dir/VBoxGuest.sys \
 	$(PATH_TARGET)/VBoxGuestCat.dir/VBoxControl.exe \
@@ -270,9 +270,9 @@
 	NT3x/Readme.txt=$(VBOX_PATH_ADDITIONS_SRC)/WINNT/Installer/ISO/NT3xReadme.txt \
 	NT3x/VBoxGuest.sys=$(VBOX_PATH_ADDITIONS.win.x86)/VBoxGuest.sys \
-	NT3x/VBoxGuest.cat=$(VBOX_PATH_ADDITIONS.win.x86)/VBoxGuest.cat \
+	$(if-expr defined(VBOX_SIGN_ADDITIONS),NT3x/VBoxGuest.cat=$(VBOX_PATH_ADDITIONS.win.x86)/VBoxGuest.cat,) \
 	NT3x/VBoxGuest.inf=$(VBOX_PATH_ADDITIONS.win.x86)/VBoxGuest.inf \
 	NT3x/VBoxMouseNT.sys=$(VBOX_PATH_ADDITIONS.win.x86)/VBoxMouseNT.sys \
 	NT3x/VBoxMouse.inf=$(VBOX_PATH_ADDITIONS.win.x86)/VBoxMouse.inf \
-	NT3x/VBoxMouse.cat=$(VBOX_PATH_ADDITIONS.win.x86)/VBoxMouse.cat \
+	$(if-expr defined(VBOX_SIGN_ADDITIONS),NT3x/VBoxMouse.cat=$(VBOX_PATH_ADDITIONS.win.x86)/VBoxMouse.cat,) \
 	NT3x/VBoxMouse.sys=$(VBOX_PATH_ADDITIONS.win.x86)/VBoxMouse.sys \
 	NT3x/VBoxControl.exe=$(VBOX_PATH_ADDITIONS.win.x86)/VBoxControl.exe \
Index: /trunk/src/VBox/Additions/WINNT/Mouse/NT5/Makefile.kmk
===================================================================
--- /trunk/src/VBox/Additions/WINNT/Mouse/NT5/Makefile.kmk	(revision 76193)
+++ /trunk/src/VBox/Additions/WINNT/Mouse/NT5/Makefile.kmk	(revision 76194)
@@ -56,5 +56,5 @@
 VBoxMouse-inf_SOURCES = \
 	$(PATH_TARGET)/VBoxMouseCat.dir/VBoxMouse.inf \
-	$(PATH_TARGET)/VBoxMouseCat.dir/VBoxMouse.cat
+	$(if-expr defined(VBOX_SIGN_ADDITIONS),$(PATH_TARGET)/VBoxMouseCat.dir/VBoxMouse.cat,)
 VBoxMouse-inf_CLEAN += \
 	$(PATH_TARGET)/VBoxMouseCat.dir/VBoxMouse.cat \