--- openconnect-internal.h.org	2023-05-19 18:12:15.000000000 +0200
+++ openconnect-internal.h	2023-12-12 18:38:19.651357296 +0100
@@ -85,6 +85,7 @@
 #define N_(s) s
 
 #include <libxml/tree.h>
+#include <libxml/parser.h>
 #include <zlib.h>
 
 #ifdef _WIN32