From 5fe631e98f982eb19512ef5920cbceacfde3277e Mon Sep 17 00:00:00 2001
From: Erik Auerswald <auerswal@unix-ag.uni-kl.de>
Date: Wed, 7 Jan 2026 00:47:32 +0100
Subject: [PATCH] configure.ac: improve portability

Testing string equality using "test" is done with the "="
operator.  Bash also accepts "==", but this is not portable.
The issue was noticed on NetBSD, which uses a patch to the
generated "configure" script[1].

[1] https://cvsweb.netbsd.org/bsdweb.cgi/pkgsrc/net/fping/patches/patch-configure?rev=1.3;content-type=text%2Fplain
---
 CHANGELOG.md | 1 +
 configure.ac | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index d83086d..2abab21 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@ Next
 - ci: Removed travis-ci (#446, thanks @gsnw-sebast)
 - Performance optimization: reduce number of select calls and use
   recvmsg with MSG_DONTWAIT instead (#449)
+- Improved compatibility with NetBSD (#452, thanks @auerswal)
 
 fping 5.5 (2025-12-31)
 ======================
diff --git a/configure.ac b/configure.ac
index 115f906..27454a9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -39,7 +39,7 @@ AS_IF([test "x$enable_ipv6" != "xno"], [
       #include <sys/types.h>
   ]])
 ])
-AS_IF([test "x$have_ipv6" == "xyes"], [
+AS_IF([test "x$have_ipv6" = "xyes"], [
     dnl Test if IPv6 is supported
        AC_CHECK_HEADERS([netinet/ip6.h], [have_ipv6="yes"], [have_ipv6="no"], [[
       #include <netinet/in.h>
-- 
2.43.0