diff -Nru freecad-0.18~pre1+dfsg1/debian/changelog freecad-0.18~pre1+dfsg1/debian/changelog
--- freecad-0.18~pre1+dfsg1/debian/changelog	2019-03-02 09:42:57.000000000 +0000
+++ freecad-0.18~pre1+dfsg1/debian/changelog	2019-07-02 16:57:55.000000000 +0000
@@ -1,3 +1,11 @@
+freecad (0.18~pre1+dfsg1-5+rpi1) buster-staging; urgency=medium
+
+  * Add include of Inventor/system/gl.h to src/Gui/SoFCOffscreenRenderer.cpp
+    and src/Gui/Quarter/SoQTQuarterAdaptor.cpp
+  * Fix clean target.
+
+ -- Peter Michael Green <plugwash@raspbian.org>  Tue, 02 Jul 2019 16:57:55 +0000
+
 freecad (0.18~pre1+dfsg1-5) unstable; urgency=medium
 
   * [e91ae47] Fix update-alternatives problem (Closes: #923465 #923412)
diff -Nru freecad-0.18~pre1+dfsg1/debian/patches/include-Inventor-system-gl.h.patch freecad-0.18~pre1+dfsg1/debian/patches/include-Inventor-system-gl.h.patch
--- freecad-0.18~pre1+dfsg1/debian/patches/include-Inventor-system-gl.h.patch	1970-01-01 00:00:00.000000000 +0000
+++ freecad-0.18~pre1+dfsg1/debian/patches/include-Inventor-system-gl.h.patch	2019-07-02 16:57:55.000000000 +0000
@@ -0,0 +1,35 @@
+Description:  Add includes of Inventor/system/gl.h to src/Gui/SoFCOffscreenRenderer.cpp and src/Gui/Quarter/SoQTQuarterAdaptor.cpp
+ The build was failing on buster armhf/raspbian with 
+ .
+ /<<BUILDDIR>>/freecad-0.18~pre1+dfsg1/src/Gui/SoFCOffscreenRenderer.cpp:602:34: error: 'GL_RGB32F_ARB' was not declared in this scope
+ .
+ This define seems to be provided by Inventor/system/gl.h 
+ 
+ src/Gui/Quarter/SoQTQuarterAdaptor.cpp then also failed with a bunch of opengl errors,
+ so I added the header there too.
+Author: Peter Michael Green <plugwash@raspbian.org>
+
+Index: freecad-0.18~pre1+dfsg1.new/src/Gui/SoFCOffscreenRenderer.cpp
+===================================================================
+--- freecad-0.18~pre1+dfsg1.new.orig/src/Gui/SoFCOffscreenRenderer.cpp
++++ freecad-0.18~pre1+dfsg1.new/src/Gui/SoFCOffscreenRenderer.cpp
+@@ -32,6 +32,7 @@
+ # include <QImage>
+ # include <QImageWriter>
+ #endif
++#include <Inventor/system/gl.h>
+ 
+ //gcc
+ # include <iomanip>
+Index: freecad-0.18~pre1+dfsg1.new/src/Gui/Quarter/SoQTQuarterAdaptor.cpp
+===================================================================
+--- freecad-0.18~pre1+dfsg1.new.orig/src/Gui/Quarter/SoQTQuarterAdaptor.cpp
++++ freecad-0.18~pre1+dfsg1.new/src/Gui/Quarter/SoQTQuarterAdaptor.cpp
+@@ -33,6 +33,7 @@
+ #include <Inventor/SoPickedPoint.h>
+ #include <Inventor/SbLine.h>
+ #include <Inventor/SbPlane.h>
++#include <Inventor/system/gl.h>
+ 
+ static unsigned char fps2dfont[][12] = {
+     {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0 }, //
diff -Nru freecad-0.18~pre1+dfsg1/debian/patches/series freecad-0.18~pre1+dfsg1/debian/patches/series
--- freecad-0.18~pre1+dfsg1/debian/patches/series	2019-03-02 09:41:08.000000000 +0000
+++ freecad-0.18~pre1+dfsg1/debian/patches/series	2019-07-02 16:57:55.000000000 +0000
@@ -7,3 +7,4 @@
 exclude_ply.patch
 disable_memory_check.patch
 remove_doc-files.patch
+include-Inventor-system-gl.h.patch
diff -Nru freecad-0.18~pre1+dfsg1/debian/rules freecad-0.18~pre1+dfsg1/debian/rules
--- freecad-0.18~pre1+dfsg1/debian/rules	2019-03-02 09:40:57.000000000 +0000
+++ freecad-0.18~pre1+dfsg1/debian/rules	2019-07-02 16:57:55.000000000 +0000
@@ -64,3 +64,8 @@
 
 override_dh_missing-arch:
 	dh_missing --list-missing
+
+override_dh_auto_clean:
+	dh_auto_clean
+	rm -rf debian/build-*
+	rm -rf `find . -name __pycache__`