From d26a9d583f9c22ece39bc5bdb170154537cd94c7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fr=C3=A9d=C3=A9ric=20Fauberteau?= <frederic@fauberteau.org>
Date: Mon, 9 Jan 2023 16:26:36 +0100
Subject: [PATCH] Fix portability issue with some shells (#3970)

---
 m4/erlang-extra.m4 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/m4/erlang-extra.m4 b/m4/erlang-extra.m4
index 4a7311bad..95c4b138d 100644
--- a/m4/erlang-extra.m4
+++ b/m4/erlang-extra.m4
@@ -75,7 +75,7 @@ EOF
 	if test "x`cat conftest.out`" != "xok"; then
 	   AC_MSG_RESULT([failed])
 	   X="`cat conftest.out`"
-	   if test "[$3]" == "warn"; then
+	   if test "[$3]" = "warn"; then
 	      AC_MSG_WARN([$X])
 	   else
 	      AC_MSG_FAILURE([$X])