From 7302df8be39127ecdb4613610e08da8c8ba584e9 Mon Sep 17 00:00:00 2001
From: "Hendrik v. Raven" <hendrik@consetetur.de>
Date: Mon, 10 Jul 2023 12:12:31 +0200
Subject: [PATCH] add missing stdlib import

wx_Treebook uses std::function which is not defined (at least) when
using wxWidgets 3.0.5.1. Fix this by adding the import
---
 include/widgets/wx_treebook.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/widgets/wx_treebook.h b/include/widgets/wx_treebook.h
index 45c794e8f2..456e904728 100644
--- a/include/widgets/wx_treebook.h
+++ b/include/widgets/wx_treebook.h
@@ -24,6 +24,7 @@
 #ifndef WX_TREEBOOK_H
 #define WX_TREEBOOK_H
 
+#include <functional>
 #include <wx/treebook.h>
 
 class WX_TREEBOOK : public wxTreebook