Add Wix dependency.

Makefile

@@ -135,9 +135,11 @@ ifeq ($(INTERNAL_BUILD), 1)
 	$(AXIS_DEP) $(DSMLJAR_DEP) $(DSDOC_DEP)
 endif
 
+# Pull WiX MSI toolkit on Windows.
+ifeq ($(ARCH), WINNT)
+COMPONENT_DEPENDENCIES += $(WIX_DEP)
 ## Only fetch the necessary components for ApacheDS when requested
 ifeq ($(BUILD_NTDS),1)
-ifeq ($(ARCH), WINNT)
 COMPONENT_DEPENDENCIES += $(WRAPPER_DEP) $(SWIG_DEP) $(MAVEN_DEP) $(APACHEDS_DEP) 
 endif
 endif