diff -up VTK-8.2.0/Rendering/Qt/vtkQtLabelRenderStrategy.cxx.qt5.15 VTK-8.2.0/Rendering/Qt/vtkQtLabelRenderStrategy.cxx
--- VTK-8.2.0/Rendering/Qt/vtkQtLabelRenderStrategy.cxx.qt5.15	2019-01-30 10:15:13.000000000 -0700
+++ VTK-8.2.0/Rendering/Qt/vtkQtLabelRenderStrategy.cxx	2020-09-17 21:36:06.985605614 -0600
@@ -41,6 +41,7 @@
 #include <QImage>
 #include <QMap>
 #include <QPainter>
+#include <QPainterPath>
 #include <QPair>
 #include <QPixmap>
 #include <QTextDocument>