diff -pruN 9.4.1-1/debian/changelog 9.4.1-1ubuntu1/debian/changelog
--- 9.4.1-1/debian/changelog	2023-02-07 08:01:51.000000000 +0000
+++ 9.4.1-1ubuntu1/debian/changelog	2023-03-18 11:42:41.000000000 +0000
@@ -1,3 +1,10 @@
+deal.ii (9.4.1-1ubuntu1) lunar; urgency=medium
+
+  * Build with --max-parallel=3 on riscv64 to avoid
+    build failure with no log
+
+ -- Graham Inggs <ginggs@ubuntu.com>  Sat, 18 Mar 2023 11:42:41 +0000
+
 deal.ii (9.4.1-1) unstable; urgency=medium
 
   * New upstream point release
diff -pruN 9.4.1-1/debian/control 9.4.1-1ubuntu1/debian/control
--- 9.4.1-1/debian/control	2023-01-29 13:22:09.000000000 +0000
+++ 9.4.1-1ubuntu1/debian/control	2023-03-18 11:42:41.000000000 +0000
@@ -3,7 +3,8 @@ Section: libs
 Priority: optional
 Standards-Version: 4.6.1
 Rules-Requires-Root: no
-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: Matthias Maier <tamiko+DEBIAN@kyomu.43-1.org>,
            Graham Inggs <ginggs@debian.org>
 Vcs-Browser: https://salsa.debian.org/science-team/deal.ii
diff -pruN 9.4.1-1/debian/rules 9.4.1-1ubuntu1/debian/rules
--- 9.4.1-1/debian/rules	2023-01-29 13:22:09.000000000 +0000
+++ 9.4.1-1ubuntu1/debian/rules	2023-03-16 18:11:51.000000000 +0000
@@ -3,12 +3,17 @@
 export OMPI_MCA_plm_rsh_agent=/bin/false
 export OMPI_MCA_rmaps_base_oversubscribe=1
 
+DH_MAX_PARALLEL=
+ifneq (,$(filter $(DEB_HOST_ARCH),riscv64))
+  DH_MAX_PARALLEL=--max-parallel=3
+endif
+
 ifneq (,$(filter $(DEB_HOST_ARCH),ppc64el))
 CONFIGURE_LINKER_FLAGS=-DDEAL_II_LINKER_FLAGS="-Wl,-Bsymbolic-functions"
 endif
 
 %:
-	dh $@
+	dh $@ $(DH_MAX_PARALLEL)
 
 # The following (optional) dependencies are missing because they are not
 # packaged in debian: