--- ../../libraries/install/include/CGAL/Nef_3/OGL_helper.h	2010-06-09 21:00:52.000000000 +0200
+++ OGL_helper.h	2011-09-29 23:09:47.000000000 +0200
@@ -243,6 +243,22 @@
     glVertex3dv(pc); 
   }
 
+  inline void CGAL_GLU_TESS_CALLBACK combineCallback(GLdouble coords[3], GLvoid *[4], GLfloat [4], GLvoid **dataOut)
+  { static std::list<GLdouble*> pcache;
+    if (dataOut) {
+      GLdouble *n = new GLdouble[3];
+      n[0] = coords[0];
+      n[1] = coords[1];
+      n[2] = coords[2];
+      pcache.push_back(n);
+      *dataOut = n;
+    } else {
+      for (std::list<GLdouble*>::const_iterator i = pcache.begin(); i != pcache.end(); i++)
+        delete[] *i;
+      pcache.clear();
+    }
+  }
+
 
  enum { SNC_AXES};
  enum { SNC_BOUNDARY, SNC_SKELETON };
@@ -376,6 +392,8 @@
       GLUtesselator* tess_ = gluNewTess();
       gluTessCallback(tess_, GLenum(GLU_TESS_VERTEX_DATA),
 		      (GLvoid (CGAL_GLU_TESS_CALLBACK *)(CGAL_GLU_TESS_DOTS)) &vertexCallback);
+      gluTessCallback(tess_, GLenum(GLU_TESS_COMBINE),
+		      (GLvoid (CGAL_GLU_TESS_CALLBACK *)(CGAL_GLU_TESS_DOTS)) &combineCallback);
       gluTessCallback(tess_, GLenum(GLU_TESS_BEGIN),
 		      (GLvoid (CGAL_GLU_TESS_CALLBACK *)(CGAL_GLU_TESS_DOTS)) &beginCallback);
       gluTessCallback(tess_, GLenum(GLU_TESS_END),