From 801784ae89224d004dc79af95545acbdf547ce64 Mon Sep 17 00:00:00 2001
From: Thorsten Kukuk <kukuk@suse.com>
Date: Fri, 16 Jun 2023 09:28:21 +0200
Subject: check_users: prefer systemd-logind over utmp

Prefer systemd-logind over utmp to get the number of logged in users.
utmp is not reliable for this (e.g. some terminals create utmp entries,
other not) and utmp is not Y2038 safe with glibc on Linux.
---
 configure.ac | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 069cc625..a294b00f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -328,6 +328,25 @@ AS_IF([test "x$with_ldap" != "xno"], [
   LIBS="$_SAVEDLIBS"
 ])
 
+
+AC_ARG_WITH([systemd], [AS_HELP_STRING([--without-systemd], [Skips systemd support])])
+
+dnl Check for libsystemd
+AS_IF([test "x$with_systemd" != "xno"], [
+  _SAVEDLIBS="$LIBS"
+  AC_CHECK_LIB(systemd,sd_get_sessions,,,-lsystemd)
+  if test "$ac_cv_lib_systemd_sd_get_sessions" = "yes"; then
+    SYSTEMDLIBS="-lsystemd"
+    SYSTEMDINCLUDE=""
+    AC_SUBST(SYSTEMDLIBS)
+    AC_SUBST(SYSTEMDINCLUDE)
+  else
+    AC_MSG_WARN([Skipping systemd support])
+  fi
+  LIBS="$_SAVEDLIBS"
+])
+
+
 dnl Check for headers used by check_ide_smart
 case $host in
   *linux*)
-- 
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