--- a/debian/rules	2017-12-26 08:41:29.306724894 +0000
--- b/debian/rules	2017-12-26 09:15:50.208246261 +0000
@@ -6,12 +6,16 @@
 
 override_dh_auto_build:
 	dh_auto_build
-	PYTHONPATH=. sphinx-build -N -bhtml docs/ docs/build/html # HTML generator
-	PYTHONPATH=. sphinx-build -N -bman docs/ docs/build/man # Manpage generator
+	PYTHONPATH=. sphinx-build -N -bhtml docs/ -d debian/doctrees docs/build/html # HTML generator
+	PYTHONPATH=. sphinx-build -N -bman docs/ -d debian/doctrees docs/build/man # Manpage generator
 
 override_dh_auto_test:
 	# The tarball doesn't contain runtest.py.
 
+override_dh_auto_clean: 
+	dh_auto-clean
+	rm -rf debian/doctrees
+
 override_dh_auto_install: 
 	dh_auto_install
 	# We don't install examples in dist-packages