diff -Nru apertium-3.7.1/debian/changelog apertium-3.7.1/debian/changelog
--- apertium-3.7.1/debian/changelog	2020-12-22 04:12:17.000000000 +0000
+++ apertium-3.7.1/debian/changelog	2021-09-29 15:12:26.000000000 +0000
@@ -1,3 +1,10 @@
+apertium (3.7.1-1ubuntu1) impish; urgency=medium
+
+  * debian/patches/endianness.patch: include the necessary header to
+    configure the code for endianness.
+
+ -- Steve Langasek <steve.langasek@ubuntu.com>  Wed, 29 Sep 2021 08:12:26 -0700
+
 apertium (3.7.1-1) unstable; urgency=low
 
   [ Tino Didriksen ]
diff -Nru apertium-3.7.1/debian/control apertium-3.7.1/debian/control
--- apertium-3.7.1/debian/control	2020-12-22 04:11:11.000000000 +0000
+++ apertium-3.7.1/debian/control	2021-09-29 15:12:26.000000000 +0000
@@ -1,7 +1,8 @@
 Source: apertium
 Section: science
 Priority: optional
-Maintainer: Debian Science Team <debian-science-maintainers@alioth-lists.debian.net>
+Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
+XSBC-Original-Maintainer: Debian Science Team <debian-science-maintainers@alioth-lists.debian.net>
 Uploaders: Tino Didriksen <tino@didriksen.cc>,
            Kartik Mistry <kartik@debian.org>
 Build-Depends: autoconf,
diff -Nru apertium-3.7.1/debian/patches/endianness.patch apertium-3.7.1/debian/patches/endianness.patch
--- apertium-3.7.1/debian/patches/endianness.patch	1970-01-01 00:00:00.000000000 +0000
+++ apertium-3.7.1/debian/patches/endianness.patch	2021-09-29 15:12:26.000000000 +0000
@@ -0,0 +1,20 @@
+Description: include the necessary header to configure the code for endianness
+ This source file has code to configure the regexp engine for the correct
+ host endianness, however, it is missing the include that allows the code to
+ know what the host endianness is.  Correct this omission.
+Author: Steve Langasek <steve.langasek@ubuntu.com>
+Last-Update: 2021-09-29
+Forwarded: no
+
+Index: apertium-3.7.1/apertium/apertium_re.cc
+===================================================================
+--- apertium-3.7.1.orig/apertium/apertium_re.cc
++++ apertium-3.7.1/apertium/apertium_re.cc
+@@ -14,6 +14,7 @@
+  * You should have received a copy of the GNU General Public License
+  * along with this program; if not, see <http://www.gnu.org/licenses/>.
+  */
++#include "apertium/apertium_config.h"
+ #include <apertium/apertium_re.h>
+ #include <lttoolbox/compression.h>
+ #include <iostream>
diff -Nru apertium-3.7.1/debian/patches/series apertium-3.7.1/debian/patches/series
--- apertium-3.7.1/debian/patches/series	1970-01-01 00:00:00.000000000 +0000
+++ apertium-3.7.1/debian/patches/series	2021-09-29 15:07:34.000000000 +0000
@@ -0,0 +1 @@
+endianness.patch