From 88091f7c94080b4c5916cb9d25f89e20bb34e619 Mon Sep 17 00:00:00 2001
From: German Service Network <support@gsnw.de>
Date: Sat, 30 Sep 2023 21:12:59 +0200
Subject: [PATCH] Checking obsolete macro AC_GNU_SOURCE as of autoconf-2.62

---
 configure.ac | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index f70a4a7..8cede20 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4,7 +4,8 @@ dnl Minimum Autoconf version required.
 AC_PREREQ(2.59)
 
 AC_INIT([fping],[5.1])
-AC_GNU_SOURCE
+
+m4_ifdef([AC_AUTOCONF_VERSION],[AC_USE_SYSTEM_EXTENSIONS], [AC_GNU_SOURCE])
 
 dnl --disable-ipv4
 AC_ARG_ENABLE([ipv4],