https://bugs.gentoo.org/917549
https://gitlab.gnome.org/GNOME/libgsf/-/commit/b6719aa4a8a0fc3acfd8e7ab339b3493f7251b22

From b6719aa4a8a0fc3acfd8e7ab339b3493f7251b22 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=BCrg=20Billeter?= <j@bitron.ch>
Date: Fri, 24 Nov 2023 19:47:35 +0100
Subject: [PATCH] xml: Fix build with libxml2 2.12

--- a/gsf/gsf-libxml.h
+++ b/gsf/gsf-libxml.h
@@ -23,6 +23,7 @@
 #define GSF_LIBXML_H
 
 #include <gsf/gsf-fwd.h>
+#include <libxml/parser.h>
 #include <libxml/tree.h>
 
 G_BEGIN_DECLS
-- 
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