diff -pruN 0.9.4+ds-1/debian/changelog 0.9.4+ds-1ubuntu1/debian/changelog
--- 0.9.4+ds-1/debian/changelog	2022-08-08 15:46:28.000000000 +0000
+++ 0.9.4+ds-1ubuntu1/debian/changelog	2023-01-25 19:52:07.000000000 +0000
@@ -1,3 +1,10 @@
+plfit (0.9.4+ds-1ubuntu1) lunar; urgency=medium
+
+  * Merge with Debian unstable (LP: #2003905). Remaining changes:
+    - use 64bit long double on s390x (LP #1962311)
+
+ -- Bryce Harrington <bryce@canonical.com>  Wed, 25 Jan 2023 11:52:07 -0800
+
 plfit (0.9.4+ds-1) unstable; urgency=medium
 
   * New upstream minor version.
@@ -12,6 +19,24 @@ plfit (0.9.4+ds-1) unstable; urgency=med
 
  -- Jerome Benoit <calculus@rezozer.net>  Mon, 08 Aug 2022 15:46:28 +0000
 
+plfit (0.9.3+ds-1ubuntu2) lunar; urgency=medium
+
+  * No-change rebuild with Python 3.11 as default
+
+ -- Graham Inggs <ginggs@ubuntu.com>  Sun, 25 Dec 2022 20:30:49 +0000
+
+plfit (0.9.3+ds-1ubuntu1) jammy; urgency=medium
+
+  * use 64bit long double on s390x (LP: #1962311) 
+
+ -- Heinrich Schuchardt <heinrich.schuchardt@canonical.com>  Fri, 25 Feb 2022 14:48:50 +0100
+
+plfit (0.9.3+ds-1build1) jammy; urgency=medium
+
+  * No-change rebuild with Python 3.10 as default version
+
+ -- Graham Inggs <ginggs@ubuntu.com>  Thu, 13 Jan 2022 20:16:01 +0000
+
 plfit (0.9.3+ds-1) unstable; urgency=medium
 
   * New upstrean nano release.
diff -pruN 0.9.4+ds-1/debian/control 0.9.4+ds-1ubuntu1/debian/control
--- 0.9.4+ds-1/debian/control	2022-08-08 15:22:38.000000000 +0000
+++ 0.9.4+ds-1ubuntu1/debian/control	2023-01-25 19:52:07.000000000 +0000
@@ -1,5 +1,6 @@
 Source: plfit
-Maintainer: Debian Science Maintainers <debian-science-maintainers@lists.alioth.debian.org>
+Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
+XSBC-Original-Maintainer: Debian Science Maintainers <debian-science-maintainers@lists.alioth.debian.org>
 Uploaders: Jerome Benoit <calculus@rezozer.net>
 Section: math
 Priority: optional
diff -pruN 0.9.4+ds-1/debian/rules 0.9.4+ds-1ubuntu1/debian/rules
--- 0.9.4+ds-1/debian/rules	2022-08-08 15:42:19.000000000 +0000
+++ 0.9.4+ds-1ubuntu1/debian/rules	2023-01-25 19:04:06.000000000 +0000
@@ -7,6 +7,11 @@ export DEB_BUILD_MAINT_OPTIONS=hardening
 BUILDIR_STATIC=_BUILD_STATIC
 BUILDIR_SHARED=_BUILD_SHARED
 
+DEB_HOST_ARCH ?= $(shell dpkg-architecture -qDEB_HOST_ARCH 2>/dev/null)
+ifneq (,$(filter s390x,$(DEB_HOST_ARCH)))
+export DEB_CFLAGS_APPEND = -mlong-double-64
+endif
+
 %:
 	dh $@ --buildsystem=cmake --with python3 --builddirectory=$(BUILDIR_SHARED)