Source: https://src.fedoraproject.org/rpms/pidgin-sipe/blob/rawhide/f/pidgin-sipe-1.25.0-fix-libxml2-2.12-build.patch
---
From 8c37bad762decd3aad86cfe758187a610804b196 Mon Sep 17 00:00:00 2001
From: Stefan Becker <chemobejk@gmail.com>
Date: Mon, 22 Jan 2024 22:47:20 +0200
Subject: [PATCH 1/2] xml: update for libxml2 >= 2.12 API changes

- error callback is now passed a const error
- provide alternative implementation for the deprecated
  xmlSAXUserParseMemory() API
---
 src/core/sipe-xml.c | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/src/core/sipe-xml.c b/src/core/sipe-xml.c
index cfc53115..e69d6d02 100644
--- a/src/core/sipe-xml.c
+++ b/src/core/sipe-xml.c
@@ -154,7 +154,13 @@ static void callback_error(void *user_data, const char *msg, ...)
 	g_free(errmsg);
 }
 
-static void callback_serror(void *user_data, xmlErrorPtr error)
+static void callback_serror(void *user_data,
+#if LIBXML_VERSION > 21200
+			    const xmlError *error
+#else
+			    xmlErrorPtr error
+#endif
+)
 {
 	struct _parser_data *pd = user_data;
 
@@ -217,8 +223,31 @@ sipe_xml *sipe_xml_parse(const gchar *string, gsize length)
 	if (string && length) {
 		struct _parser_data *pd = g_new0(struct _parser_data, 1);
 
+#if LIBXML_VERSION > 21200
+		xmlParserCtxtPtr ctxt = xmlNewSAXParserCtxt(&parser, pd);
+
+		if (ctxt) {
+			xmlCtxtReadMemory(ctxt,
+					  string,
+					  length,
+					  NULL,
+					  NULL,
+					  0);
+
+			pd->error = !ctxt->wellFormed;
+
+			if (ctxt->myDoc) {
+				xmlFreeDoc(ctxt->myDoc);
+				ctxt->myDoc = NULL;
+			}
+
+			xmlFreeParserCtxt(ctxt);
+		} else
+			pd->error = TRUE;
+#else
 		if (xmlSAXUserParseMemory(&parser, pd, string, length))
 			pd->error = TRUE;
+#endif
 
 		if (pd->error) {
 			sipe_xml_free(pd->root);
-- 
2.43.0

