diff -Nru gnome-system-tools-3.0.0/debian/changelog gnome-system-tools-3.0.0/debian/changelog
--- gnome-system-tools-3.0.0/debian/changelog	2024-03-31 06:12:52.000000000 +0000
+++ gnome-system-tools-3.0.0/debian/changelog	2024-04-03 22:38:40.000000000 +0000
@@ -1,3 +1,10 @@
+gnome-system-tools (3.0.0-9.1ubuntu4) noble; urgency=medium
+
+  * d/p/implicit_declaration.patch: add missing declarations to resolve
+    ftbfs (LP: #2060165).
+
+ -- Vladimir Petko <vladimir.petko@canonical.com>  Thu, 04 Apr 2024 11:38:40 +1300
+
 gnome-system-tools (3.0.0-9.1ubuntu3) noble; urgency=medium
 
   * No-change rebuild for CVE-2024-3094
diff -Nru gnome-system-tools-3.0.0/debian/patches/implicit_declaration.patch gnome-system-tools-3.0.0/debian/patches/implicit_declaration.patch
--- gnome-system-tools-3.0.0/debian/patches/implicit_declaration.patch	1970-01-01 00:00:00.000000000 +0000
+++ gnome-system-tools-3.0.0/debian/patches/implicit_declaration.patch	2024-04-03 22:38:40.000000000 +0000
@@ -0,0 +1,29 @@
+Description: add missing declarations
+ Add missing headers and declarations to resolve -Werror=implicit-function-declaration.
+Author: Vladimir Petko <vladimir.petko@canonical.com>
+Bug-Ubuntu: https://bugs.launchpad.net/debian/+source/gnome-system-tools/+bug/2060165
+Bug-Debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1066239
+Forwarded: no
+Last-Update: 2024-04-04
+
+--- a/src/shares/shares-tool.h
++++ b/src/shares/shares-tool.h
+@@ -58,6 +58,7 @@
+ };
+
+ GstSharesTool *gst_shares_tool_new (void);
++GType gst_shares_tool_get_type();
+
+
+ G_END_DECLS
+--- a/src/shares/shares-tool.c
++++ b/src/shares/shares-tool.c
+@@ -23,6 +23,8 @@
+ #include "users-table.h"
+ #include <glib/gi18n.h>
+ #include "gst.h"
++#include "table.h"
++#include "share-settings.h"
+
+ static void gst_shares_tool_class_init (GstSharesToolClass *class);
+ static void gst_shares_tool_init       (GstSharesTool      *tool);
diff -Nru gnome-system-tools-3.0.0/debian/patches/series gnome-system-tools-3.0.0/debian/patches/series
--- gnome-system-tools-3.0.0/debian/patches/series	2020-04-08 13:25:53.000000000 +0000
+++ gnome-system-tools-3.0.0/debian/patches/series	2024-04-03 22:38:40.000000000 +0000
@@ -23,3 +23,4 @@
 max_group_name_32_chars.patch
 remove_g_thread_init.patch
 70_gst-yelp.patch
+implicit_declaration.patch