diff -Nru ayatana-indicator-datetime-0.8.2/debian/changelog ayatana-indicator-datetime-0.8.2/debian/changelog
--- ayatana-indicator-datetime-0.8.2/debian/changelog	2021-02-03 11:36:06.000000000 +0000
+++ ayatana-indicator-datetime-0.8.2/debian/changelog	2021-10-07 00:31:21.000000000 +0000
@@ -1,3 +1,9 @@
+ayatana-indicator-datetime (0.8.2-1+rpi1) bookworm-staging; urgency=medium
+
+  * Apply upstream patch to fix FTBFS (Closes: 995279)
+
+ -- Peter Michael Green <plugwash@raspbian.org>  Thu, 07 Oct 2021 00:31:21 +0000
+
 ayatana-indicator-datetime (0.8.2-1) unstable; urgency=medium
 
   * New upstream release.
diff -Nru ayatana-indicator-datetime-0.8.2/debian/patches/fix-ftbfs.patch ayatana-indicator-datetime-0.8.2/debian/patches/fix-ftbfs.patch
--- ayatana-indicator-datetime-0.8.2/debian/patches/fix-ftbfs.patch	1970-01-01 00:00:00.000000000 +0000
+++ ayatana-indicator-datetime-0.8.2/debian/patches/fix-ftbfs.patch	2021-10-07 00:30:26.000000000 +0000
@@ -0,0 +1,35 @@
+commit 19923632dad08eaa7db476d77035db5135abb9d9
+Author: Olivier Tilloy <olivier.tilloy@canonical.com>
+Date:   Thu Mar 4 23:30:27 2021 +0100
+
+    Fix a couple of build failures on Ubuntu hirsute:
+    
+     - src/engine-eds.cpp: use i_cal_component_free for ICalComponent
+     - src/exporter.cpp: drop unnecessary G_OBJECT cast
+
+diff --git a/src/engine-eds.cpp b/src/engine-eds.cpp
+index f8a4ce8..277c090 100644
+--- a/src/engine-eds.cpp
++++ b/src/engine-eds.cpp
+@@ -1210,7 +1210,7 @@ private:
+                 }
+             }
+ 
+-            g_clear_pointer(&icc, icalcomponent_free);
++            g_clear_pointer(&icc, i_cal_component_free);
+         }
+     }
+ 
+diff --git a/src/exporter.cpp b/src/exporter.cpp
+index 305adfb..ea514c0 100644
+--- a/src/exporter.cpp
++++ b/src/exporter.cpp
+@@ -162,7 +162,7 @@ private:
+ 
+     void on_bus_acquired(GDBusConnection* bus, const gchar* /*name*/)
+     {
+-        m_bus = static_cast<GDBusConnection*>(g_object_ref(G_OBJECT(bus)));
++        m_bus = static_cast<GDBusConnection*>(g_object_ref(bus));
+ 
+         // export the alarm properties
+         GError * error = nullptr;
diff -Nru ayatana-indicator-datetime-0.8.2/debian/patches/series ayatana-indicator-datetime-0.8.2/debian/patches/series
--- ayatana-indicator-datetime-0.8.2/debian/patches/series	2021-02-03 11:36:06.000000000 +0000
+++ ayatana-indicator-datetime-0.8.2/debian/patches/series	2021-10-07 00:30:52.000000000 +0000
@@ -1 +1,2 @@
 0001_port-to-lomiri-url-dispatcher.patch
+fix-ftbfs.patch