diff --git a/include/gui/glshadersimple.h b/include/gui/glshadersimple.h
index f64ad74b3..65b370f5f 100644
--- a/include/gui/glshadersimple.h
+++ b/include/gui/glshadersimple.h
@@ -15,8 +15,8 @@
 // along with this program. If not, see <http://www.gnu.org/licenses/>.          //
 ///////////////////////////////////////////////////////////////////////////////////
 
-#ifndef INCLUDE_GUI_GLSHADERSIMPLEPOLYLINE_H_
-#define INCLUDE_GUI_GLSHADERSIMPLEPOLYLINE_H_
+#ifndef INCLUDE_GUI_GLSHADERSIMPLE_H_
+#define INCLUDE_GUI_GLSHADERSIMPLE_H_
 
 #include <QString>
 
@@ -47,4 +47,4 @@ private:
 	static const QString m_fragmentShaderSourceColored;
 };
 
-#endif /* INCLUDE_GUI_GLSHADERSIMPLEPOLYLINE_H_ */
+#endif /* INCLUDE_GUI_GLSHADERSIMPLE_H_ */
diff --git a/include/gui/glshadertextured.h b/include/gui/glshadertextured.h
index 69546497c..2e5343f8d 100644
--- a/include/gui/glshadertextured.h
+++ b/include/gui/glshadertextured.h
@@ -3,6 +3,7 @@
 // written by Edouard Griffiths                                                  //
 //                                                                               //
 // See: http://glslstudio.com/primer/#gl2frag                                    //
+//      https://gitlab.com/pteam/korvins-qtbase/blob/5.4/examples/opengl/cube/mainwidget.cpp //
 //                                                                               //
 // This program is free software; you can redistribute it and/or modify          //
 // it under the terms of the GNU General Public License as published by          //
diff --git a/include/gui/glspectrum.h b/include/gui/glspectrum.h
index 133b3ac97..dee37cc5a 100644
--- a/include/gui/glspectrum.h
+++ b/include/gui/glspectrum.h
@@ -73,8 +73,10 @@ public:
 private:
 	struct ChannelMarkerState {
 		ChannelMarker* m_channelMarker;
+#ifdef GL_DEPRECATED
 		QRectF m_glRect;
 		QRectF m_glRectDsb;
+#endif
 		QMatrix4x4 m_glMatrixWaterfall;
 		QMatrix4x4 m_glMatrixDsbWaterfall;
 		QMatrix4x4 m_glMatrixFreqScale;
@@ -84,9 +86,11 @@ private:
 		QRect m_rect;
 
 		ChannelMarkerState(ChannelMarker* channelMarker) :
-			m_channelMarker(channelMarker),
+			m_channelMarker(channelMarker)
+#ifdef GL_DEPRECATED
 			m_glRect(),
 			m_glRectDsb()
+#endif
 		{ }
 	};
 	QList<ChannelMarkerState*> m_channelMarkerStates;
diff --git a/sdrbase/gui/glspectrum.cpp b/sdrbase/gui/glspectrum.cpp
index 2025367f2..da01a809a 100644
--- a/sdrbase/gui/glspectrum.cpp
+++ b/sdrbase/gui/glspectrum.cpp
@@ -1774,20 +1774,14 @@ void GLSpectrum::applyChanges()
 		}
 
 
-		// draw the effective BW rectangle
-		dv->m_glRect.setRect(
-			m_frequencyScale.getPosFromValue(xc + nw) / (float)(width() - leftMargin - rightMargin),
-			0,
-			(pw-nw) / (float)m_sampleRate,
-			1);
-
 		// draw the DSB rectangle
+#ifdef GL_DEPRECATED
 		dv->m_glRectDsb.setRect(
 			m_frequencyScale.getPosFromValue(xc - (dsbw/2)) / (float)(width() - leftMargin - rightMargin),
 			0,
 			dsbw / (float)m_sampleRate,
 			1);
-
+#endif
 		QMatrix4x4 glMatrixDsb;
 		glMatrixDsb.setToIdentity();
 		glMatrixDsb.translate(
@@ -1829,6 +1823,14 @@ void GLSpectrum::applyChanges()
 			(float) frequencyScaleHeight / (float) height()
 		);
 
+		// draw the effective BW rectangle
+#ifdef GL_DEPRECATED
+		dv->m_glRect.setRect(
+			m_frequencyScale.getPosFromValue(xc + nw) / (float)(width() - leftMargin - rightMargin),
+			0,
+			(pw-nw) / (float)m_sampleRate,
+			1);
+#endif
 		QMatrix4x4 glMatrix;
 		glMatrix.setToIdentity();
 		glMatrix.translate(