--- a/source/Panel.h 2020-05-01 21:02:38.000000000 +0200
+++ b/source/Panel.h 2020-09-05 07:34:01.667091079 +0200
@@ -15,6 +15,7 @@
#include "Rectangle.h"
+#include <string>
#include <functional>
#include <list>