diff -Nru a/src/formats/vobsub/vobsubinputprocessdialog.cpp b/src/formats/vobsub/vobsubinputprocessdialog.cpp
--- a/src/formats/vobsub/vobsubinputprocessdialog.cpp	2017-09-18 01:11:43.000000000 +0200
+++ b/src/formats/vobsub/vobsubinputprocessdialog.cpp	2018-01-20 16:40:27.276855816 +0100
@@ -25,6 +25,8 @@
 #include "mplayer/vobsub.h"
 #include "mplayer/spudec.h"
 
+#include <functional>
+
 #include <QDebug>
 #include <QPainter>
 #include <QKeyEvent>