--- 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>