* fix build error

* make betterer polygon splitting an option
* add GL_LEQUAL depth test for 'equal' mode, might help

src/frontend/qt_sdl/VideoSettingsDialog.h

@@ -64,6 +64,7 @@ private slots:
     void on_sbVSyncInterval_valueChanged(int val);
 
     void on_cbxGLResolution_currentIndexChanged(int idx);
+    void on_cbBetterPolygons_stateChanged(int state);
 
     void on_cbSoftwareThreaded_stateChanged(int state);