I am uploading a LowNMU to DELAYED/10 in order to fix this.
diff -Nru ijs-0.35/debian/changelog ijs-0.35/debian/changelog
--- ijs-0.35/debian/changelog 2019-08-16 12:15:57.000000000 +0200
+++ ijs-0.35/debian/changelog 2023-06-12 11:51:51.000000000 +0200
@@ -1,3 +1,10 @@
+ijs (0.35-15.1) unstable; urgency=medium
+
+ * Non-maintainer upload.
+ * Build-depend on automake. Closes: #865167.
+
+ -- Bastian Germann <b...@debian.org> Mon, 12 Jun 2023 11:51:51 +0200
+
ijs (0.35-15) unstable; urgency=medium
* Rename patches, and document patch micro policy in source.
diff -Nru ijs-0.35/debian/control ijs-0.35/debian/control
--- ijs-0.35/debian/control 2019-08-16 12:06:28.000000000 +0200
+++ ijs-0.35/debian/control 2023-06-12 11:35:05.000000000 +0200
@@ -6,7 +6,7 @@
Build-Depends: cdbs,
autotools-dev,
libtool,
- automake1.11,
+ automake,
autoconf,
debhelper (>= 9~),
Build-Depends-Indep: docbook,
diff -Nru ijs-0.35/debian/rules ijs-0.35/debian/rules
--- ijs-0.35/debian/rules 2019-05-11 12:13:27.000000000 +0200
+++ ijs-0.35/debian/rules 2023-06-12 11:35:15.000000000 +0200
@@ -18,9 +18,9 @@
# along with this program. If not, see <http://www.gnu.org/licenses/>.
DEB_AUTO_UPDATE_LIBTOOL = pre
-DEB_AUTO_UPDATE_AUTOCONF = 2.68
-DEB_AUTO_UPDATE_ACLOCAL = 1.11
-DEB_AUTO_UPDATE_AUTOMAKE = 1.11
+DEB_AUTO_UPDATE_AUTOCONF = 2.69
+DEB_AUTO_UPDATE_ACLOCAL = 1.16
+DEB_AUTO_UPDATE_AUTOMAKE = 1.16
DEB_AUTOMAKE_ARGS = --add-missing
include /usr/share/cdbs/1/class/autotools.mk
include /usr/share/cdbs/1/rules/debhelper.mk
