From Mike Wittman, support for reference parameters

src/osgIntrospection/Reflector.cpp

@@ -0,0 +1,11 @@
+#include <osgIntrospection/Reflector>
+
+namespace osgIntrospection
+{
+    template<>
+    void Reflector<void>::init_reference_types()
+    {
+        // Avoid trying to register void & / const void &, which are
+        // illegal types.
+    }
+}