--- vv/vvLandmarksGlyph.cxx.orig	2026-03-02 00:16:24 UTC
+++ vv/vvLandmarksGlyph.cxx
@@ -26,6 +26,7 @@
 #include "vtkPolyData.h"
 #include "vtkUnsignedCharArray.h"
 #include <cassert>
+#include <iostream>
 
 vtkStandardNewMacro(vvLandmarksGlyph);
 
