$OpenBSD: patch-src_library_groupbydialog_h,v 1.3 2021/03/18 18:04:32 tb Exp $

Index: src/library/groupbydialog.h
--- src/library/groupbydialog.h.orig
+++ src/library/groupbydialog.h
@@ -20,6 +20,7 @@
 
 #include <QDialog>
 #include <memory>
+#include <functional>
 
 #include "librarymodel.h"
 
