diff -Nru shadow-4.13+dfsg1/debian/changelog shadow-4.13+dfsg1/debian/changelog
--- shadow-4.13+dfsg1/debian/changelog	2024-02-22 12:30:23.000000000 +0000
+++ shadow-4.13+dfsg1/debian/changelog	2024-04-09 07:01:02.000000000 +0000
@@ -1,3 +1,15 @@
+shadow (1:4.13+dfsg1-4ubuntu3) noble; urgency=medium
+
+  * Fix ftbfs with -Werror=implicit-function-declaration.
+
+ -- Matthias Klose <doko@ubuntu.com>  Tue, 09 Apr 2024 09:01:02 +0200
+
+shadow (1:4.13+dfsg1-4ubuntu2) noble; urgency=high
+
+  * No change rebuild for 64-bit time_t and frame pointers.
+
+ -- Julian Andres Klode <juliank@ubuntu.com>  Mon, 08 Apr 2024 18:19:19 +0200
+
 shadow (1:4.13+dfsg1-4ubuntu1) noble; urgency=medium
 
   * Merge with Debian unstable. Remaining changes:
diff -Nru shadow-4.13+dfsg1/debian/patches/fix-implicit-func.diff shadow-4.13+dfsg1/debian/patches/fix-implicit-func.diff
--- shadow-4.13+dfsg1/debian/patches/fix-implicit-func.diff	1970-01-01 00:00:00.000000000 +0000
+++ shadow-4.13+dfsg1/debian/patches/fix-implicit-func.diff	2024-04-09 07:01:02.000000000 +0000
@@ -0,0 +1,35 @@
+--- a/src/chfn.c
++++ b/src/chfn.c
+@@ -19,14 +19,20 @@
+ #include <getopt.h>
+ #include "defines.h"
+ #include "getdef.h"
++#include "groupio.h"
+ #include "nscd.h"
+ #include "sssd.h"
+ #ifdef USE_PAM
+ #include "pam_defs.h"
+ #endif
+ #include "prototypes.h"
++#ifdef  SHADOWGRP
++#include "sgroupio.h"
++#endif
+ #include "pwauth.h"
+ #include "pwio.h"
++#include "shadowio.h"
++#include "subordinateio.h"
+ /*@-exitarg@*/
+ #include "exitcodes.h"
+ #include "shadowlog.h"
+--- a/src/groupdel.c
++++ b/src/groupdel.c
+@@ -31,6 +31,9 @@
+ #ifdef	SHADOWGRP
+ #include "sgroupio.h"
+ #endif
++#include "pwio.h"
++#include "shadowio.h"
++#include "subordinateio.h"
+ #include "shadowlog.h"
+ /*
+  * Global variables
diff -Nru shadow-4.13+dfsg1/debian/patches/series shadow-4.13+dfsg1/debian/patches/series
--- shadow-4.13+dfsg1/debian/patches/series	2024-02-22 12:30:23.000000000 +0000
+++ shadow-4.13+dfsg1/debian/patches/series	2024-04-09 06:52:18.000000000 +0000
@@ -28,3 +28,4 @@
 1014_extrausers_delgroup.patch
 1015_add_zsys_support.patch
 1016_extrausers_gpasswd.patch
+fix-implicit-func.diff