In file included from /usr/include/qt/QtWidgets/qgraphicslayoutitem.h:46,
                 from /usr/include/qt/QtWidgets/qgraphicswidget.h:45,
                 from /usr/include/qt/QtWidgets/QGraphicsWidget:1,
                 from /tmp/makepkg/dolphin-root/src/dolphin-19.08.3/src/kitemviews/kitemlistwidget.h:30,
                 from /tmp/makepkg/dolphin-root/src/dolphin-19.08.3/src/kitemviews/kitemlistview.h:28,
                 from /tmp/makepkg/dolphin-root/src/dolphin-19.08.3/src/kitemviews/kstandarditemlistview.h:24,
                 from /tmp/makepkg/dolphin-root/src/dolphin-19.08.3/src/kitemviews/kfileitemlistview.h:24,
                 from /tmp/makepkg/dolphin-root/src/dolphin-19.08.3/src/views/dolphinitemlistview.h:24,
                 from /tmp/makepkg/dolphin-root/src/dolphin-19.08.3/src/views/dolphinview.cpp:25:
/usr/include/qt/QtGui/qevent.h:219:16: note: declared here
  219 |     inline int delta() const  { return qt4D; }
      |                ^~~~~
/tmp/makepkg/dolphin-root/src/dolphin-19.08.3/src/views/dolphinview.cpp: In member function ‘void DolphinView::slotHeaderContextMenuRequested(const QPointF&)’:
/tmp/makepkg/dolphin-root/src/dolphin-19.08.3/src/views/dolphinview.cpp:904:73: warning: ‘QSet<T> QList<T>::toSet() const [with T = QByteArray]’ is deprecated: Use QSet<T>(list.begin(), list.end()) instead. [-Wdeprecated-declarations]
  904 |     const QSet<QByteArray> visibleRolesSet = view->visibleRoles().toSet();
      |                                                                         ^
In file included from /usr/include/qt/QtCore/qobject.h:49,
                 from /usr/include/qt/QtWidgets/qwidget.h:45,
                 from /usr/include/qt/QtWidgets/qtabwidget.h:44,
                 from /usr/include/qt/QtWidgets/QTabWidget:1,
                 from /tmp/makepkg/dolphin-root/src/dolphin-19.08.3/src/dolphintabwidget.h:23,
                 from /tmp/makepkg/dolphin-root/src/dolphin-19.08.3/src/views/dolphinview.h:24,
                 from /tmp/makepkg/dolphin-root/src/dolphin-19.08.3/src/views/dolphinview.cpp:21:
/usr/include/qt/QtCore/qlist.h:413:13: note: declared here
  413 |     QSet<T> toSet() const;
      |             ^~~~~
make[1]: *** [CMakeFiles/Makefile2:1575: src/CMakeFiles/dolphinprivate.dir/all] Error 2
make: *** [Makefile:130: all] Error 2
==> ERROR: A failure occurred in build().
    Aborting..