https://bugs.gentoo.org/906227
https://github.com/dajobe/raptor/issues/59
https://github.com/dajobe/raptor/pull/58

From 4dbc4c1da2a033c497d84a1291c46f416a9cac51 Mon Sep 17 00:00:00 2001
From: David Anes <david.anes@suse.com>
Date: Thu, 4 May 2023 11:54:02 +0200
Subject: [PATCH] Remove the access to entities 'checked' private symbol for
 libxml2 2.11.0

Since version 2.11.0, some private symbols that were never intended
as public API/ABI have been removed from libxml2, therefore the field
'checked' is no longer present and raptor fails to build in this
scenario.
--- a/src/raptor_libxml.c
+++ b/src/raptor_libxml.c
@@ -246,10 +246,11 @@ raptor_libxml_getEntity(void* user_data, const xmlChar *name)
     
     ret->owner = 1;
 
-#if LIBXML_VERSION >= 20627
+#if LIBXML_VERSION >= 20627 && LIBXML_VERSION < 21100
     /* Checked field was released in 2.6.27 on 2006-10-25
      * http://git.gnome.org/browse/libxml2/commit/?id=a37a6ad91a61d168ecc4b29263def3363fff4da6
      *
+     * and was later removed in version 2.11.0
      */
 
     /* Mark this entity as having been checked - never do this again */