https://github.com/rbowler/spinhawk/pull/106

From 9a9f7182069b8fe0483383c177882218244bad16 Mon Sep 17 00:00:00 2001
From: Mike Frysinger <vapier@gentoo.org>
Date: Thu, 18 Nov 2021 02:32:02 -0500
Subject: [PATCH] avoid bashism in test call

POSIX test only supports =, not ==.
---
 autoconf/hercules.m4 | 2 +-
 configure.ac         | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index f12d47058562..8dd420af8d13 100644
--- a/configure.ac
+++ b/configure.ac
@@ -562,7 +562,7 @@ AC_CHECK_DECLS( SIOCADDRT,            [hc_cv_have_siocaddrt=yes],           [hc_
 AC_CHECK_DECLS( SIOCDELRT,            [hc_cv_have_siocdelrt=yes],           [hc_cv_have_siocdelrt=no],           [#include <linux/sockios.h>] )
 AC_CHECK_DECLS( SIOCDIFADDR,          [hc_cv_have_siocdifaddr=yes],         [hc_cv_have_siocdifaddr=no],         [#include <linux/sockios.h>] )
 
-if test "$hc_cv_have_sys_mtio_h" == "yes"; then
+if test "$hc_cv_have_sys_mtio_h" = "yes"; then
     AC_CHECK_DECLS( MTEWARN,          [hc_cv_have_mtewarn=yes],             [hc_cv_have_mtewarn=no],             [#include <sys/mtio.h>] )
 else
     hc_cv_have_mtewarn=no
-- 
2.33.0