diff -pruN 2.4.1-8/debian/changelog 2.4.1-8ubuntu1/debian/changelog
--- 2.4.1-8/debian/changelog	2022-11-30 17:45:56.000000000 +0000
+++ 2.4.1-8ubuntu1/debian/changelog	2023-01-25 03:33:52.000000000 +0000
@@ -1,3 +1,11 @@
+libbpp-phyl (2.4.1-8ubuntu1) lunar; urgency=low
+
+  * Merge from Debian unstable. Remaining changes:
+    - Build without LTO on s390x and arm64 as this causes misbehavior that
+      breaks bppsuite.
+
+ -- Steve Langasek <steve.langasek@ubuntu.com>  Tue, 24 Jan 2023 19:33:52 -0800
+
 libbpp-phyl (2.4.1-8) unstable; urgency=medium
 
   * Fix watch file
@@ -5,6 +13,14 @@ libbpp-phyl (2.4.1-8) unstable; urgency=
 
  -- Andreas Tille <tille@debian.org>  Wed, 30 Nov 2022 18:45:56 +0100
 
+libbpp-phyl (2.4.1-7ubuntu1) kinetic; urgency=low
+
+  * Merge from Debian unstable. Remaining changes:
+    - Build without LTO on s390x and arm64 as this causes misbehavior that
+      breaks bppsuite.
+
+ -- Steve Langasek <steve.langasek@ubuntu.com>  Tue, 19 Jul 2022 08:31:20 -0700
+
 libbpp-phyl (2.4.1-7) unstable; urgency=medium
 
   * Team upload.
@@ -14,6 +30,13 @@ libbpp-phyl (2.4.1-7) unstable; urgency=
 
  -- Étienne Mollier <emollier@debian.org>  Sat, 09 Jul 2022 20:52:45 +0200
 
+libbpp-phyl (2.4.1-6ubuntu1) kinetic; urgency=medium
+
+  * Build without LTO on s390x and arm64 as this causes misbehavior that
+    breaks bppsuite.
+
+ -- Steve Langasek <steve.langasek@ubuntu.com>  Wed, 06 Jul 2022 15:44:53 +0000
+
 libbpp-phyl (2.4.1-6) unstable; urgency=medium
 
   * Fix symbols again
@@ -306,3 +329,4 @@ libbpp-phyl (1.5.1) unstable; urgency=lo
   * Initial Release.
 
  -- Julien Dutheil <jdutheil@birc.au.dk>  Mon, 21 Jul 2008 15:17:26 +0200
+
diff -pruN 2.4.1-8/debian/control 2.4.1-8ubuntu1/debian/control
--- 2.4.1-8/debian/control	2022-11-30 17:45:56.000000000 +0000
+++ 2.4.1-8ubuntu1/debian/control	2022-11-30 21:56:37.000000000 +0000
@@ -1,5 +1,6 @@
 Source: libbpp-phyl
-Maintainer: Debian Med Packaging Team <debian-med-packaging@lists.alioth.debian.org>
+Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
+XSBC-Original-Maintainer: Debian Med Packaging Team <debian-med-packaging@lists.alioth.debian.org>
 Uploaders: Julien Dutheil <julien.dutheil@univ-montp2.fr>,
            Andreas Tille <tille@debian.org>
 Section: science
diff -pruN 2.4.1-8/debian/rules 2.4.1-8ubuntu1/debian/rules
--- 2.4.1-8/debian/rules	2022-11-30 17:45:56.000000000 +0000
+++ 2.4.1-8ubuntu1/debian/rules	2022-11-30 21:56:37.000000000 +0000
@@ -4,6 +4,10 @@
 
 export DEB_BUILD_MAINT_OPTIONS = hardening=+all
 
+ifneq (,(filter(arm64 s390x,$(DEB_HOST_BUILD_ARCH))))
+	DEB_BUILD_MAINT_OPTIONS += optimize=-lto
+endif
+
 CMAKE_EXTRA_FLAGS += -DBUILD_TESTING=OFF
 
 %: