$NetBSD: patch-configure,v 1.1 2018/05/31 14:45:56 youri Exp $

Portability fix.

--- configure.orig	2018-04-17 15:48:19.000000000 +0000
+++ configure
@@ -16773,14 +16773,14 @@ fi
 
 
 if test "$enable_kerberos" != "no"; then
-  if test "$enable_kerberos" == "yes" &&
-     test "$have_kerberos" == "no" ; then
+  if test "$enable_kerberos" = "yes" &&
+     test "$have_kerberos" = "no" ; then
       as_fn_error $? "kerberos support requested, but not available" "$LINENO" 5
   fi
 
   enable_kerberos=$have_kerberos
 
-  if test "$enable_kerberos" == "yes"; then
+  if test "$enable_kerberos" = "yes"; then
 
 $as_echo "#define GCR_API_SUBJECT_TO_CHANGE 1" >>confdefs.h
 
