diff -pruN 3.1.0~beta.2-3/debian/changelog 3.1.0~beta.2-3ubuntu2/debian/changelog
--- 3.1.0~beta.2-3/debian/changelog	2019-09-15 12:55:00.000000000 +0000
+++ 3.1.0~beta.2-3ubuntu2/debian/changelog	2022-06-03 23:01:39.000000000 +0000
@@ -1,3 +1,45 @@
+stdx-allocator (3.1.0~beta.2-3ubuntu2) kinetic; urgency=medium
+
+  * No-change rebuild against libphobos2-ldc-shared99
+
+ -- Steve Langasek <steve.langasek@ubuntu.com>  Fri, 03 Jun 2022 23:01:39 +0000
+
+stdx-allocator (3.1.0~beta.2-3ubuntu1) jammy; urgency=medium
+
+  * Build without LTO on s390x to fix a build failure.
+
+ -- Steve Langasek <steve.langasek@ubuntu.com>  Mon, 13 Dec 2021 23:02:14 -0800
+
+stdx-allocator (3.1.0~beta.2-3build5) hirsute; urgency=medium
+
+  * No-change rebuild for ldc defaults change.
+
+ -- Matthias Klose <doko@ubuntu.com>  Thu, 05 Nov 2020 11:34:40 +0100
+
+stdx-allocator (3.1.0~beta.2-3build4) groovy; urgency=medium
+
+  * Rebuild against new libphobos2-ldc-shared91.
+
+ -- Gianfranco Costamagna <locutusofborg@debian.org>  Wed, 10 Jun 2020 11:36:05 +0200
+
+stdx-allocator (3.1.0~beta.2-3build3) focal; urgency=medium
+
+  * Rebuild against new ldc90.
+
+ -- Gianfranco Costamagna <locutusofborg@debian.org>  Fri, 21 Feb 2020 09:03:03 +0100
+
+stdx-allocator (3.1.0~beta.2-3build2) focal; urgency=medium
+
+  * Rebuild against new ldc90.
+
+ -- Gianfranco Costamagna <locutusofborg@debian.org>  Thu, 20 Feb 2020 20:43:36 +0100
+
+stdx-allocator (3.1.0~beta.2-3build1) focal; urgency=medium
+
+  * Rebuild against new ldc88.
+
+ -- Gianfranco Costamagna <locutusofborg@debian.org>  Tue, 21 Jan 2020 17:53:41 +0100
+
 stdx-allocator (3.1.0~beta.2-3) unstable; urgency=medium
 
   * Tighten dependency on libmir-core-dev
diff -pruN 3.1.0~beta.2-3/debian/control 3.1.0~beta.2-3ubuntu2/debian/control
--- 3.1.0~beta.2-3/debian/control	2019-09-15 12:54:36.000000000 +0000
+++ 3.1.0~beta.2-3ubuntu2/debian/control	2021-12-14 07:02:14.000000000 +0000
@@ -1,7 +1,8 @@
 Source: stdx-allocator
 Section: libs
 Priority: optional
-Maintainer: Debian D Language Group <team+d-team@tracker.debian.org>
+Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
+XSBC-Original-Maintainer: Debian D Language Group <team+d-team@tracker.debian.org>
 Uploaders: Matthias Klumpp <mak@debian.org>
 Build-Depends: debhelper-compat (= 12),
                dh-dlang,
diff -pruN 3.1.0~beta.2-3/debian/rules 3.1.0~beta.2-3ubuntu2/debian/rules
--- 3.1.0~beta.2-3/debian/rules	2018-08-29 00:50:48.000000000 +0000
+++ 3.1.0~beta.2-3ubuntu2/debian/rules	2021-12-14 07:02:11.000000000 +0000
@@ -2,6 +2,12 @@
 # -*- makefile -*-
 #export DH_VERBOSE=1
 
+DEB_HOST_ARCH ?= $(shell dpkg-architecture -qDEB_HOST_ARCH)
+
+ifeq ($(DEB_HOST_ARCH), s390x)
+export DEB_BUILD_MAINT_OPTIONS = optimize=-lto
+endif
+
 include /usr/share/dh-dlang/dlang-flags.mk
 
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