diff -Nru mrpt-2.5.0+ds/debian/changelog mrpt-2.5.0+ds/debian/changelog
--- mrpt-2.5.0+ds/debian/changelog	2022-07-22 06:04:27.000000000 +0000
+++ mrpt-2.5.0+ds/debian/changelog	2022-07-30 07:40:43.000000000 +0000
@@ -1,3 +1,10 @@
+mrpt (1:2.5.0+ds-2~rpi1) bookworm; urgency=medium
+
+  * Rebuild against ffmpeg 4.
+  * Fix clean target.
+
+ -- Peter Michael Green <plugwash@raspbian.org>  Sat, 30 Jul 2022 07:40:43 +0000
+
 mrpt (1:2.5.0+ds-2) unstable; urgency=medium
 
   * Team upload.
diff -Nru mrpt-2.5.0+ds/debian/rules mrpt-2.5.0+ds/debian/rules
--- mrpt-2.5.0+ds/debian/rules	2022-07-19 04:48:38.000000000 +0000
+++ mrpt-2.5.0+ds/debian/rules	2022-07-30 07:40:43.000000000 +0000
@@ -70,3 +70,7 @@
 
 override_dh_auto_test:
 	dh_auto_build -O--buildsystem=cmake -- $(MRPT_TEST_TARGET)
+
+execute_after_dh_auto_clean:
+	rm -f doc/graphslam-engine-guide/graphslam-engine-guide.pdf  doc/graphslam-engine-guide/graphslam-engine-guide.ps.gz
+	rm -f doc/graphslam-engine-guide/graphslam-engine-guide.aux doc/graphslam-engine-guide/graphslam-engine-guide.bbl doc/graphslam-engine-guide/graphslam-engine-guide.blg doc/graphslam-engine-guide/graphslam-engine-guide.fdb_latexmk doc/graphslam-engine-guide/graphslam-engine-guide.fls doc/graphslam-engine-guide/graphslam-engine-guide.log doc/graphslam-engine-guide/graphslam-engine-guide.out doc/graphslam-engine-guide/graphslam-engine-guide.toc