$NetBSD: patch-configure,v 1.4 2018/09/20 13:30:11 fhajny Exp $

Portability.

--- configure.orig	2018-09-17 11:27:47.000000000 +0000
+++ configure
@@ -15579,7 +15579,7 @@ $as_echo "#define OS_AIX 1" >>confdefs.h
 
   ;;
 esac
- if test x$os_type == xapple; then
+ if test x$os_type = xapple; then
   OS_APPLE_TRUE=
   OS_APPLE_FALSE='#'
 else
@@ -15587,7 +15587,7 @@ else
   OS_APPLE_FALSE=
 fi
 
- if test x$os_type == xlinux; then
+ if test x$os_type = xlinux; then
   OS_LINUX_TRUE=
   OS_LINUX_FALSE='#'
 else
@@ -15595,7 +15595,7 @@ else
   OS_LINUX_FALSE=
 fi
 
- if test x$os_type == xaix; then
+ if test x$os_type = xaix; then
   OS_AIX_TRUE=
   OS_AIX_FALSE='#'
 else