$NetBSD$

POSIXly correct test(1) for equality.

--- configure.orig	2022-04-26 13:05:15.329563183 +0000
+++ configure
@@ -14804,7 +14804,7 @@ fi
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for readline.h" >&5
 $as_echo_n "checking for readline.h... " >&6; }
 
-  if test "x$cross_compiling" == "xyes"; then
+  if test "x$cross_compiling" = "xyes"; then
       without_readline=yes
   fi