$NetBSD: patch-ad,v 1.1 2007/02/23 20:21:09 drochner Exp $

--- Rendering/vtkXRenderWindowInteractor.h.orig	2007-02-23 16:13:26.000000000 +0100
+++ Rendering/vtkXRenderWindowInteractor.h
@@ -42,6 +42,8 @@
 
 class vtkCallbackCommand;
 
+void vtkXRenderWindowInteractorCallback(Widget,XtPointer, XEvent *,Boolean *);
+
 class VTK_RENDERING_EXPORT vtkXRenderWindowInteractor : public vtkRenderWindowInteractor
 {
 public: