https://bugs.gentoo.org/923020
https://github.com/mysql/mysql-workbench/pull/43

From 8f8917671ab5a06f842a340f31c6d4ec7634147a Mon Sep 17 00:00:00 2001
From: Alfred Wingate <parona@protonmail.com>
Date: Sat, 27 Jan 2024 22:51:15 +0200
Subject: [PATCH] Fix support for libxml2-2.12 with its api and header changes

Signed-off-by: Alfred Wingate <parona@protonmail.com>
--- a/library/grt/src/grt.h
+++ b/library/grt/src/grt.h
@@ -34,6 +34,7 @@
 #include <vector>
 #include <stdexcept>
 #include <boost/function.hpp>
+#include <libxml/tree.h>
 #include <libxml/xmlmemory.h>
 #include "base/threading.h"
 #include <string>
--- a/library/grt/src/unserializer.cpp
+++ b/library/grt/src/unserializer.cpp
@@ -401,7 +401,11 @@ ValueRef internal::Unserializer::unserialize_xmldata(const char *data, size_t si
   xmlDocPtr doc = xmlReadMemory(data, (int)size, NULL, NULL, XML_PARSE_NOENT);
 
   if (!doc) {
+#if LIBXML_VERSION >= 21200
+    const xmlError* error = xmlGetLastError();
+#else
     xmlErrorPtr error = xmlGetLastError();
+#endif
 
     if (error)
       throw std::runtime_error(base::strfmt("Could not parse XML data. Line %d, %s", error->line, error->message));