https://github.com/shadow-maint/shadow/commit/a281f241b592aec636d1b93a99e764499d68c7ef
https://github.com/shadow-maint/shadow/pull/595

From a281f241b592aec636d1b93a99e764499d68c7ef Mon Sep 17 00:00:00 2001
From: Florian Weimer <fweimer@redhat.com>
Date: Mon, 21 Nov 2022 11:52:45 +0100
Subject: [PATCH] Fix HAVE_SHADOWGRP configure check

The missing #include <gshadow.h> causes the configure check to fail
spuriously, resulting in HAVE_SHADOWGRP not being defined even
on systems that actually have sgetsgent (such as current glibc).
--- a/configure.ac
+++ b/configure.ac
@@ -116,6 +116,10 @@ if test "$ac_cv_header_shadow_h" = "yes"; then
 		ac_cv_libc_shadowgrp,
 		AC_RUN_IFELSE([AC_LANG_SOURCE([
 				#include <shadow.h>
+				#ifdef HAVE_GSHADOW_H
+				#include <gshadow.h>
+				#endif
+				int
 				main()
 				{
 					struct sgrp *sg = sgetsgent("test:x::");

--- a/configure
+++ b/configure
@@ -15684,6 +15684,10 @@ else $as_nop
 /* end confdefs.h.  */
 
 				#include <shadow.h>
+				#ifdef HAVE_GSHADOW_H
+				#include <gshadow.h>
+				#endif
+				int
 				main()
 				{
 					struct sgrp *sg = sgetsgent("test:x::");