--- a/source/Panel.h 2021-01-17 14:25:52.952063261 +0100
+++ b/source/Panel.h 2021-01-17 14:29:26.466536974 +0100
@@ -15,6 +15,7 @@
#include "Rectangle.h"
+#include <string>
#include <functional>
#include <list>