https://code.videolan.org/videolan/libbluray/-/merge_requests/44

From c1550e5cfd92229373f4cb729e2320827b9d22a8 Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Wed, 31 May 2023 07:15:59 +0100
Subject: [PATCH] configure.ac: Fix explicit --with-external-libudfread
 handling

We need "!= xno" [0] if we want the default to be *enabled*, otherwise passing
--with-external-libudfread actually ends up disabling it.

[0] https://www.gnu.org/software/autoconf/manual/autoconf-2.71/html_node/External-Software.html
--- a/configure.ac
+++ b/configure.ac
@@ -316,7 +316,7 @@ AM_CONDITIONAL([BDJ_J2SE], [ test x"$BDJ_TYPE" != x"j2me" ])
 dnl bootclasspath
 AC_SUBST(BDJ_BOOTCLASSPATH)
 
-AS_IF([test "x$with_external_libudfread" = "xyes"], [
+AS_IF([test "x$with_external_libudfread" != "xno"], [
     PKG_CHECK_MODULES([LIBUDFREAD], [libudfread >= 1.1.0],
         [with_libudfread=yes
          AC_DEFINE([HAVE_LIBUDFREAD], [1], [Define to 1 if external libudfread is to be used])
-- 
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