diff -Nru mummer-3.23+dfsg/debian/changelog mummer-3.23+dfsg/debian/changelog
--- mummer-3.23+dfsg/debian/changelog	2016-07-27 06:17:02.000000000 +0000
+++ mummer-3.23+dfsg/debian/changelog	2016-11-17 20:32:47.000000000 +0000
@@ -1,3 +1,13 @@
+mummer (3.23+dfsg-2) unstable; urgency=medium
+
+  * Deactivate broken patch from mugsy that was taken over in last Debian
+    release
+    Closes: #843621
+  * debhelper 10
+  * d/watch: version=4
+
+ -- Andreas Tille <tille@debian.org>  Thu, 17 Nov 2016 21:32:47 +0100
+
 mummer (3.23+dfsg-1) unstable; urgency=medium
 
   * Team upload
diff -Nru mummer-3.23+dfsg/debian/compat mummer-3.23+dfsg/debian/compat
--- mummer-3.23+dfsg/debian/compat	2016-07-27 06:17:02.000000000 +0000
+++ mummer-3.23+dfsg/debian/compat	2016-11-17 20:32:47.000000000 +0000
@@ -1 +1 @@
-9
+10
diff -Nru mummer-3.23+dfsg/debian/control mummer-3.23+dfsg/debian/control
--- mummer-3.23+dfsg/debian/control	2016-07-27 06:17:02.000000000 +0000
+++ mummer-3.23+dfsg/debian/control	2016-11-17 20:32:47.000000000 +0000
@@ -5,7 +5,7 @@
            Charles Plessy <plessy@debian.org>
 Section: science
 Priority: optional
-Build-Depends: debhelper (>= 9),
+Build-Depends: debhelper (>= 10),
                texlive-latex-base,
                texlive-latex-recommended,
                texlive-fonts-recommended
diff -Nru mummer-3.23+dfsg/debian/copyright mummer-3.23+dfsg/debian/copyright
--- mummer-3.23+dfsg/debian/copyright	2016-07-27 06:17:02.000000000 +0000
+++ mummer-3.23+dfsg/debian/copyright	2016-11-17 20:32:47.000000000 +0000
@@ -1,4 +1,4 @@
-Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
 Upstream-Name: MUMmer
 Source: https://sourceforge.net/projects/mummer/files/mummer/
 Files-Excluded: */M*.pdf
@@ -13,7 +13,8 @@
  Arthur Delcher.
 
 Files: debian/*
-Copyright: © 2005-2007, Steffen Moeller <moeller@inb.uni-luebeck.de>, and Andreas Tille <tille@debian.org>
+Copyright: 2005-2007 Steffen Moeller <moeller@inb.uni-luebeck.de>,
+           2007-2016 Andreas Tille <tille@debian.org>
 License: GPL
  Available at `/usr/share/common-licenses/GPL'.
 
diff -Nru mummer-3.23+dfsg/debian/patches/addition_from_report_duplicates.patch mummer-3.23+dfsg/debian/patches/addition_from_report_duplicates.patch
--- mummer-3.23+dfsg/debian/patches/addition_from_report_duplicates.patch	2016-07-27 06:17:02.000000000 +0000
+++ mummer-3.23+dfsg/debian/patches/addition_from_report_duplicates.patch	2016-11-17 20:32:47.000000000 +0000
@@ -1,6 +1,10 @@
 Author: Andreas Tille <tille@debian.org>
 Last-Update: Mon, 13 Apr 2015 21:50:34 +0200
-Description: The tool mugsy provides an old mummer code copy (version 3.20)
+Description: This patch is deactivated since it is most probably broken.
+ .
+ See bug #843621
+ .
+ The tool mugsy provides an old mummer code copy (version 3.20)
  with modifications to include delta-filter -b for reporting duplications.
  Since the mummer copy in mugsy does not feature all the mummer patches we
  rather inject the additional tool right into the Debian package.
diff -Nru mummer-3.23+dfsg/debian/patches/series mummer-3.23+dfsg/debian/patches/series
--- mummer-3.23+dfsg/debian/patches/series	2016-07-27 06:17:02.000000000 +0000
+++ mummer-3.23+dfsg/debian/patches/series	2016-11-17 20:32:47.000000000 +0000
@@ -5,4 +5,4 @@
 hardening.patch
 spelling.patch
 addition_from_mugsy.patch
-addition_from_report_duplicates.patch
+# most probably broken see bug #843621 addition_from_report_duplicates.patch
diff -Nru mummer-3.23+dfsg/debian/watch mummer-3.23+dfsg/debian/watch
--- mummer-3.23+dfsg/debian/watch	2016-07-27 06:17:02.000000000 +0000
+++ mummer-3.23+dfsg/debian/watch	2016-11-17 20:32:47.000000000 +0000
@@ -1,3 +1,3 @@
-version=3
+version=4
 opts="repacksuffix=+dfsg,dversionmangle=s/[+~]dfsg//g,repack,compression=xz" \
  http://sf.net/mummer/MUMmer(.+)\.tar.gz