$NetBSD: patch-configure.ac,v 1.1 2020/01/20 17:25:10 adam Exp $

Portability fix.

--- configure.ac.orig	2020-01-17 21:30:01.000000000 +0000
+++ configure.ac
@@ -461,7 +461,7 @@ dnl
 AC_ARG_ENABLE(werror,
         [  --enable-werror         halt on warnings])
 
-if test "x$enable_werror" == "xyes"; then
+if test "x$enable_werror" = "xyes"; then
 	CFLAGS="$CFLAGS -Werror"
 fi