diff '--color=auto' --unified --recursive --text rqt_image_view-0.4.13/include/rqt_image_view/image_view.h rqt_image_view-0.4.13.new/include/rqt_image_view/image_view.h
--- rqt_image_view-0.4.13/include/rqt_image_view/image_view.h	2018-05-03 00:27:26.000000000 +0200
+++ rqt_image_view-0.4.13/include/rqt_image_view/image_view.h	2020-01-09 07:57:04.907081398 +0100
@@ -51,6 +51,7 @@
 #include <QString>
 #include <QSize>
 #include <QWidget>
+#include <QSet>
 
 #include <vector>