diff --git a/krusader/Dialogs/krmaskchoice.cpp b/krusader/Dialogs/krmaskchoice.cpp
--- a/krusader/Dialogs/krmaskchoice.cpp
+++ b/krusader/Dialogs/krmaskchoice.cpp
@@ -110,7 +110,8 @@
     connect(PushButton7, &QPushButton::clicked, this, &KRMaskChoice::addSelection);
     connect(PushButton7_2, &QPushButton::clicked, this, &KRMaskChoice::deleteSelection);
     connect(PushButton7_3, &QPushButton::clicked, this, &KRMaskChoice::clearSelections);
-    connect(selection, QOverload<const QString &>::of(&KComboBox::activated), selection, &KComboBox::setEditText);
+    connect(selection, static_cast<void (KComboBox::*)(const QString &)>(&KComboBox::activated),
+            selection, &KComboBox::setEditText);
     connect(selection->lineEdit(), &QLineEdit::returnPressed, this, &KRMaskChoice::accept);
     connect(preSelections, &KrListWidget::currentItemChanged, this, &KRMaskChoice::currentItemChanged);
     connect(preSelections, &KrListWidget::itemActivated, this, &KRMaskChoice::acceptFromList);
diff --git a/krusader/Dialogs/newftpgui.cpp b/krusader/Dialogs/newftpgui.cpp
--- a/krusader/Dialogs/newftpgui.cpp
+++ b/krusader/Dialogs/newftpgui.cpp
@@ -152,8 +152,10 @@
     connect(buttonBox, &QDialogButtonBox::accepted, this, &newFTPGUI::accept);
     connect(buttonBox, &QDialogButtonBox::rejected, this, &newFTPGUI::reject);
 
-    connect(prefix, QOverload<const QString &>::of(&KComboBox::activated), this, &newFTPGUI::slotTextChanged);
-    connect(url, QOverload<const QString &>::of(&KHistoryComboBox::activated), url, &KHistoryComboBox::addToHistory);
+    connect(prefix, static_cast<void (KComboBox::*)(const QString &)>(&KComboBox::activated),
+            this, &newFTPGUI::slotTextChanged);
+    connect(url, static_cast<void (KHistoryComboBox::*)(const QString &)>(&KHistoryComboBox::activated),
+            url, &KHistoryComboBox::addToHistory);
 
     if(!lastUsedProtocol.isEmpty()) {
         // update the port field
diff --git a/krusader/Dialogs/packguibase.cpp b/krusader/Dialogs/packguibase.cpp
--- a/krusader/Dialogs/packguibase.cpp
+++ b/krusader/Dialogs/packguibase.cpp
@@ -87,8 +87,10 @@
 
     typeData = new QComboBox(this);
     typeData->setSizePolicy(QSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed));
-    connect(typeData, QOverload<const QString &>::of(&QComboBox::activated), this,  &PackGUIBase::checkConsistency);
-    connect(typeData, QOverload<const QString &>::of(&QComboBox::highlighted), this,  &PackGUIBase::checkConsistency);
+    connect(typeData, static_cast<void (QComboBox::*)(const QString &)>(&QComboBox::activated),
+            this,  &PackGUIBase::checkConsistency);
+    connect(typeData, static_cast<void (QComboBox::*)(const QString &)>(&QComboBox::highlighted),
+            this,  &PackGUIBase::checkConsistency);
     hbox->addWidget(typeData);
 
     grid->addLayout(hbox, 1, 0);
diff --git a/krusader/DiskUsage/radialMap/widget.cpp b/krusader/DiskUsage/radialMap/widget.cpp
--- a/krusader/DiskUsage/radialMap/widget.cpp
+++ b/krusader/DiskUsage/radialMap/widget.cpp
@@ -50,7 +50,7 @@
     setPalette(pal);
 
     connect(this, &Widget::created, this, &Widget::sendFakeMouseEvent);
-    connect(this, &Widget::created, this, QOverload<>::of(&Widget::update));
+    connect(this, &Widget::created, this, static_cast<void (Widget::*)()>(&Widget::update));
     connect(&m_timer, &QTimer::timeout, this, &Widget::resizeTimeout);
 }
 
diff --git a/krusader/Filter/generalfilter.cpp b/krusader/Filter/generalfilter.cpp
--- a/krusader/Filter/generalfilter.cpp
+++ b/krusader/Filter/generalfilter.cpp
@@ -168,7 +168,8 @@
     ofType->addItem(i18n("Text Files"));
     ofType->addItem(i18n("Video Files"));
     ofType->addItem(i18n("Audio Files"));
-    connect(ofType, QOverload<int>::of(&KComboBox::currentIndexChanged), this, &GeneralFilter::slotDisable);
+    connect(ofType, static_cast<void (KComboBox::*)(int)>(&KComboBox::currentIndexChanged),
+            this, &GeneralFilter::slotDisable);
 
     nameGroupLayout->addWidget(ofType, 1, 1);
     filterLayout->addWidget(nameGroup, 0, 0);
@@ -390,8 +391,10 @@
         connect(profileManager, &ProfileManager::saveToProfile, fltTabs, &FilterTabs::saveToProfile);
     }
 
-    connect(searchFor, QOverload<const QString &>::of(&KHistoryComboBox::activated), searchFor, &KHistoryComboBox::addToHistory);
-    connect(containsText, QOverload<const QString &>::of(&KHistoryComboBox::activated), containsText, &KHistoryComboBox::addToHistory);
+    connect(searchFor, static_cast<void (KHistoryComboBox::*)(const QString &)>(&KHistoryComboBox::activated),
+            searchFor, &KHistoryComboBox::addToHistory);
+    connect(containsText, static_cast<void (KHistoryComboBox::*)(const QString &)>(&KHistoryComboBox::activated),
+            containsText, &KHistoryComboBox::addToHistory);
 
     // load the completion and history lists
     // ==> search for
diff --git a/krusader/GUI/kcmdline.cpp b/krusader/GUI/kcmdline.cpp
--- a/krusader/GUI/kcmdline.cpp
+++ b/krusader/GUI/kcmdline.cpp
@@ -179,8 +179,8 @@
     QStringList list = grpSvr.readEntry("cmdline history", QStringList());
     cmdLine->setHistoryItems(list);
 
-    connect(cmdLine, QOverload<const QString &>::of(&CmdLineCombo::returnPressed), this, &KCMDLine::slotRun);
-    connect(cmdLine, QOverload<const QString &>::of(&CmdLineCombo::returnPressed), cmdLine->lineEdit(), &QLineEdit::clear);
+    connect(cmdLine, static_cast<void (CmdLineCombo::*)(const QString &)>(&CmdLineCombo::returnPressed), this, &KCMDLine::slotRun);
+    connect(cmdLine, static_cast<void (CmdLineCombo::*)(const QString &)>(&CmdLineCombo::returnPressed), cmdLine->lineEdit(), &QLineEdit::clear);
     connect(cmdLine, &CmdLineCombo::returnToPanel, this, &KCMDLine::slotReturnFocus);
 
     cmdLine->setWhatsThis(i18n("<qt><p>Well, it is actually quite simple: you type your command here and Krusader obeys.</p><p><b>Tip</b>: move within command line history with &lt;Up&gt; and &lt;Down&gt; arrows.</p></qt>"));
diff --git a/krusader/Konfigurator/kgcolors.cpp b/krusader/Konfigurator/kgcolors.cpp
--- a/krusader/Konfigurator/kgcolors.cpp
+++ b/krusader/Konfigurator/kgcolors.cpp
@@ -265,7 +265,8 @@
 
     connect(generals->find("Enable Alternate Background"), &KonfiguratorCheckBox::stateChanged, this, &KgColors::generatePreview);
     connect(colorTabWidget, &QTabWidget::currentChanged, this, &KgColors::generatePreview);
-    connect(dimFactor, QOverload<int>::of(&KonfiguratorSpinBox::valueChanged), this, &KgColors::generatePreview);
+    connect(dimFactor, static_cast<void (KonfiguratorSpinBox::*)(int)>(&KonfiguratorSpinBox::valueChanged),
+            this, &KgColors::generatePreview);
 
     kgColorsLayout->addWidget(hboxWidget, 1 , 0, 1,  3);
 
diff --git a/krusader/Konfigurator/konfiguratoritems.cpp b/krusader/Konfigurator/konfiguratoritems.cpp
--- a/krusader/Konfigurator/konfiguratoritems.cpp
+++ b/krusader/Konfigurator/konfiguratoritems.cpp
@@ -101,7 +101,8 @@
     connect(ext, &KonfiguratorExtension::setDefaultsAuto, this, &KonfiguratorCheckBox::slotSetDefaults);
     connect(ext, &KonfiguratorExtension::setInitialValue, this, &KonfiguratorCheckBox::loadInitialValue);
 
-    connect(this, &KonfiguratorCheckBox::stateChanged, ext, QOverload<>::of(&KonfiguratorExtension::setChanged));
+    connect(this, &KonfiguratorCheckBox::stateChanged,
+            ext, static_cast<void (KonfiguratorExtension::*)()>(&KonfiguratorExtension::setChanged));
     loadInitialValue();
 }
 
@@ -166,7 +167,8 @@
     connect(ext, &KonfiguratorExtension::setDefaultsAuto, this, &KonfiguratorSpinBox::slotSetDefaults);
     connect(ext, &KonfiguratorExtension::setInitialValue, this, &KonfiguratorSpinBox::loadInitialValue);
 
-    connect(this, QOverload<int>::of(&KonfiguratorSpinBox::valueChanged), ext, QOverload<>::of(&KonfiguratorExtension::setChanged));
+    connect(this, static_cast<void (KonfiguratorSpinBox::*)(int)>(&KonfiguratorSpinBox::valueChanged),
+            ext, static_cast<void (KonfiguratorExtension::*)()>(&KonfiguratorExtension::setChanged));
 
     setMinimum(min);
     setMaximum(max);
@@ -250,7 +252,8 @@
     radioNames.push_back(name);
     radioValues.push_back(value);
 
-    connect(radioWidget, &QRadioButton::toggled, ext, QOverload<>::of(&KonfiguratorExtension::setChanged));
+    connect(radioWidget, &QRadioButton::toggled,
+            ext, static_cast<void (KonfiguratorExtension::*)()>(&KonfiguratorExtension::setChanged));
 }
 
 QRadioButton * KonfiguratorRadioButtons::find(int index)
@@ -341,7 +344,8 @@
     connect(ext, &KonfiguratorExtension::setDefaultsAuto, this, &KonfiguratorEditBox::slotSetDefaults);
     connect(ext, &KonfiguratorExtension::setInitialValue, this, &KonfiguratorEditBox::loadInitialValue);
 
-    connect(this, &KonfiguratorEditBox::textChanged, ext, QOverload<>::of(&KonfiguratorExtension::setChanged));
+    connect(this, &KonfiguratorEditBox::textChanged,
+            ext, static_cast<void (KonfiguratorExtension::*)()>(&KonfiguratorExtension::setChanged));
 
     loadInitialValue();
 }
@@ -383,7 +387,8 @@
     connect(ext, &KonfiguratorExtension::setDefaultsAuto, this, &KonfiguratorURLRequester::slotSetDefaults);
     connect(ext, &KonfiguratorExtension::setInitialValue, this, &KonfiguratorURLRequester::loadInitialValue);
 
-    connect(this, &KonfiguratorURLRequester::textChanged, ext, QOverload<>::of(&KonfiguratorExtension::setChanged));
+    connect(this, &KonfiguratorURLRequester::textChanged,
+            ext, static_cast<void (KonfiguratorExtension::*)()>(&KonfiguratorExtension::setChanged));
 
     loadInitialValue();
 }
@@ -501,8 +506,10 @@
     connect(ext, &KonfiguratorExtension::setInitialValue, this, &KonfiguratorComboBox::loadInitialValue);
 
     //connect(this, &KonfiguratorComboBox::highlighted, ext, &KonfiguratorExtension::setChanged); /* Removed because of startup combo failure */
-    connect(this, QOverload<int>::of(&KonfiguratorComboBox::activated), ext, QOverload<>::of(&KonfiguratorExtension::setChanged));
-    connect(this, &KonfiguratorComboBox::currentTextChanged, ext, QOverload<>::of(&KonfiguratorExtension::setChanged));
+    connect(this, static_cast<void (KonfiguratorComboBox::*)(int)>(&KonfiguratorComboBox::activated),
+            ext, static_cast<void (KonfiguratorExtension::*)()>(&KonfiguratorExtension::setChanged));
+    connect(this, &KonfiguratorComboBox::currentTextChanged,
+            ext, static_cast<void (KonfiguratorExtension::*)()>(&KonfiguratorExtension::setChanged));
 
     setEditable(editable);
     loadInitialValue();
@@ -597,7 +604,8 @@
     addColor(i18n("Dark Gray"),     Qt::darkGray);
     addColor(i18n("Black"),         Qt::black);
 
-    connect(this, QOverload<int>::of(&KonfiguratorColorChooser::activated), this, &KonfiguratorColorChooser::slotCurrentChanged);
+    connect(this, static_cast<void (KonfiguratorColorChooser::*)(int)>(&KonfiguratorColorChooser::activated),
+            this, &KonfiguratorColorChooser::slotCurrentChanged);
 
     loadInitialValue();
 }
diff --git a/krusader/Konfigurator/krresulttable.cpp b/krusader/Konfigurator/krresulttable.cpp
--- a/krusader/Konfigurator/krresulttable.cpp
+++ b/krusader/Konfigurator/krresulttable.cpp
@@ -195,7 +195,7 @@
     urlLabel->setContentsMargins(5, 5, 5, 5);
     urlLabel->setAlignment(Qt::AlignTop);
     grid->addWidget(urlLabel, _numRows, 0);
-    connect(urlLabel, QOverload<const QString &>::of(&KUrlLabel::leftClickedUrl),
+    connect(urlLabel, static_cast<void (KUrlLabel::*)(const QString &)>(&KUrlLabel::leftClickedUrl),
             this, &KrArchiverResultTable::website);
     _label = urlLabel;
 
@@ -345,7 +345,8 @@
 
         l->setAlignment(Qt::AlignLeft | Qt::AlignTop);
         l->setContentsMargins(5, 5, 5, 5);
-        connect(l, QOverload<const QString &>::of(&KUrlLabel::leftClickedUrl), this, &KrToolResultTable::website);
+        connect(l, static_cast<void (KUrlLabel::*)(const QString &)>(&KUrlLabel::leftClickedUrl),
+                this, &KrToolResultTable::website);
     }
     grid->addWidget(toolBoxWidget, _numRows, 1);
 
diff --git a/krusader/Locate/locate.cpp b/krusader/Locate/locate.cpp
--- a/krusader/Locate/locate.cpp
+++ b/krusader/Locate/locate.cpp
@@ -226,7 +226,8 @@
 
     if (updateProcess) {
         if (updateProcess->state() == QProcess::Running) {
-            connect(updateProcess, QOverload<int, QProcess::ExitStatus>::of(&KProcess::finished), this, &LocateDlg::updateFinished);
+            connect(updateProcess, static_cast<void (KProcess::*)(int, QProcess::ExitStatus)>(&KProcess::finished),
+                    this, &LocateDlg::updateFinished);
             updateDbButton->setEnabled(false);
         } else
             updateFinished();
@@ -254,7 +255,8 @@
         *updateProcess << KrServices::fullPathName("updatedb");
         *updateProcess << KShell::splitArgs(group.readEntry("UpdateDB Arguments"));
 
-        connect(updateProcess, QOverload<int, QProcess::ExitStatus>::of(&KProcess::finished), this, &LocateDlg::updateFinished);
+        connect(updateProcess, static_cast<void (KProcess::*)(int, QProcess::ExitStatus)>(&KProcess::finished),
+                this, &LocateDlg::updateFinished);
         updateProcess->start();
         updateDbButton->setEnabled(false);
     }
@@ -298,8 +300,10 @@
     locateProc->setOutputChannelMode(KProcess::SeparateChannels); // default is forwarding to the parent channels
     connect(locateProc, &KProcess::readyReadStandardOutput, this, &LocateDlg::processStdout);
     connect(locateProc, &KProcess::readyReadStandardError, this, &LocateDlg::processStderr);
-    connect(locateProc, QOverload<int,QProcess::ExitStatus>::of(&KProcess::finished), this, &LocateDlg::locateFinished);
-    connect(locateProc, QOverload<QProcess::ProcessError>::of(&KProcess::error), this, &LocateDlg::locateError);
+    connect(locateProc, static_cast<void (KProcess::*)(int, QProcess::ExitStatus)>(&KProcess::finished),
+            this, &LocateDlg::locateFinished);
+    connect(locateProc, static_cast<void (KProcess::*)(QProcess::ProcessError)>(&KProcess::error),
+            this, &LocateDlg::locateError);
 
     *locateProc << KrServices::fullPathName("locate");
     if (!isCs)
diff --git a/krusader/MountMan/kmountmangui.cpp b/krusader/MountMan/kmountmangui.cpp
--- a/krusader/MountMan/kmountmangui.cpp
+++ b/krusader/MountMan/kmountmangui.cpp
@@ -96,8 +96,10 @@
     connect(mountButton, &QPushButton::clicked, this, &KMountManGUI::slotToggleMount);
     connect(mountList, &KrTreeWidget::itemDoubleClicked, this, &KMountManGUI::doubleClicked);
     connect(mountList, &KrTreeWidget::itemRightClicked, this, &KMountManGUI::clicked);
-    connect(mountList, &KrTreeWidget::itemClicked, this, QOverload<QTreeWidgetItem *>::of(&KMountManGUI::changeActive));
-    connect(mountList, &KrTreeWidget::itemSelectionChanged, this, QOverload<>::of(&KMountManGUI::changeActive));
+    connect(mountList, &KrTreeWidget::itemClicked,
+            this, static_cast<void (KMountManGUI::*)(QTreeWidgetItem *)>(&KMountManGUI::changeActive));
+    connect(mountList, &KrTreeWidget::itemSelectionChanged,
+            this, static_cast<void (KMountManGUI::*)()>(&KMountManGUI::changeActive));
 
     KConfigGroup group(krConfig, "MountMan");
     int sx = group.readEntry("Window Width", -1);
diff --git a/krusader/Panel/PanelView/krinterbriefview.cpp b/krusader/Panel/PanelView/krinterbriefview.cpp
--- a/krusader/Panel/PanelView/krinterbriefview.cpp
+++ b/krusader/Panel/PanelView/krinterbriefview.cpp
@@ -141,7 +141,8 @@
     _header->setSectionResizeMode(QHeaderView::Fixed);
     _header->setSectionsClickable(true);
     _header->setSortIndicatorShown(true);
-    connect(_header, &QHeaderView::sortIndicatorChanged, _model, QOverload<int, Qt::SortOrder>::of(&ListModel::sort));
+    connect(_header, &QHeaderView::sortIndicatorChanged,
+            _model, static_cast<void (ListModel::*)(int, Qt::SortOrder)>(&ListModel::sort));
     _header->installEventFilter(this);
 
     _numOfColumns = _properties->numberOfColumns;
diff --git a/krusader/Panel/krsearchbar.cpp b/krusader/Panel/krsearchbar.cpp
--- a/krusader/Panel/krsearchbar.cpp
+++ b/krusader/Panel/krsearchbar.cpp
@@ -53,7 +53,8 @@
     _modeBox = new QComboBox(this);
     _modeBox->addItems(QStringList() << i18n("Search") << i18n("Select") << i18n("Filter"));
     _modeBox->setToolTip(i18n("Change the search mode"));
-    connect(_modeBox, QOverload<int>::of(&QComboBox::currentIndexChanged), this, &KrSearchBar::onModeChange);
+    connect(_modeBox, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
+            this, &KrSearchBar::onModeChange);
 
     _currentMode = static_cast<SearchMode>(_modeBox->currentIndex());
 
diff --git a/krusader/Panel/listpanel.cpp b/krusader/Panel/listpanel.cpp
--- a/krusader/Panel/listpanel.cpp
+++ b/krusader/Panel/listpanel.cpp
@@ -194,7 +194,7 @@
     connect(urlNavigator, &KUrlNavigator::urlChanged, this, &ListPanel::slotNavigatorUrlChanged);
     connect(urlNavigator->editor()->lineEdit(), &QLineEdit::editingFinished, this, &ListPanel::resetNavigatorMode);
     connect(urlNavigator, &KUrlNavigator::tabRequested, this, [=](const QUrl &url) { ListPanel::newTab(url); });
-    connect(urlNavigator, &KUrlNavigator::urlsDropped, this, QOverload<const QUrl &, QDropEvent *>::of(&ListPanel::handleDrop));
+    connect(urlNavigator, &KUrlNavigator::urlsDropped, this, static_cast<void (ListPanel::*)(const QUrl &, QDropEvent *)>(&ListPanel::handleDrop));
     ADD_WIDGET(urlNavigator);
 
     // toolbar
@@ -437,9 +437,11 @@
     connect(view->op(), &KrViewOperator::goHome, func, &ListPanelFunc::home);
     connect(view->op(), &KrViewOperator::dirUp, func, &ListPanelFunc::dirUp);
     connect(view->op(), &KrViewOperator::defaultDeleteFiles, func, &ListPanelFunc::defaultDeleteFiles);
-    connect(view->op(), &KrViewOperator::middleButtonClicked, this,  QOverload<KrViewItem *>::of(&ListPanel::newTab));
+    connect(view->op(), &KrViewOperator::middleButtonClicked,
+            this, static_cast<void (ListPanel::*)(KrViewItem *)>(&ListPanel::newTab));
     connect(view->op(), &KrViewOperator::currentChanged, this, &ListPanel::slotCurrentChanged);
-    connect(view->op(), &KrViewOperator::renameItem, func, QOverload<const QString &, const QString &>::of(&ListPanelFunc::rename));
+    connect(view->op(), &KrViewOperator::renameItem,
+            func, static_cast<void (ListPanelFunc::*)(const QString &, const QString &)>(&ListPanelFunc::rename));
     connect(view->op(), &KrViewOperator::executed, func, &ListPanelFunc::execute);
     connect(view->op(), &KrViewOperator::goInside, func, &ListPanelFunc::goInside);
     connect(view->op(), &KrViewOperator::needFocus, this, [=]() { slotFocusOnMe(); });
diff --git a/krusader/Panel/listpanelactions.cpp b/krusader/Panel/listpanelactions.cpp
--- a/krusader/Panel/listpanelactions.cpp
+++ b/krusader/Panel/listpanelactions.cpp
@@ -42,15 +42,16 @@
 {
     // set view type
     auto *mapper = new QSignalMapper(this);
-    connect(mapper, QOverload<int>::of(&QSignalMapper::mapped), this, &ListPanelActions::setView);
+    connect(mapper, static_cast<void (QSignalMapper::*)(int)>(&QSignalMapper::mapped),
+            this, &ListPanelActions::setView);
     auto *group = new QActionGroup(this);
     group->setExclusive(true);
     QList<KrViewInstance*> views = KrViewFactory::registeredViews();
     for(int i = 0; i < views.count(); i++) {
         KrViewInstance *inst = views[i];
         QAction *action = new QAction(Icon(inst->iconName()), inst->description(), group);
         action->setCheckable(true);
-        connect(action, &QAction::triggered, mapper, QOverload<>::of(&QSignalMapper::map));
+        connect(action, &QAction::triggered, mapper, static_cast<void (QSignalMapper::*)()>(&QSignalMapper::map));
         mapper->setMapping(action, inst->id());
         _mainWindow->actions()->addAction("view" + QString::number(i), action);
         _mainWindow->actions()->setDefaultShortcut(action, inst->shortcut());
diff --git a/krusader/Panel/sidebar.cpp b/krusader/Panel/sidebar.cpp
--- a/krusader/Panel/sidebar.cpp
+++ b/krusader/Panel/sidebar.cpp
@@ -62,7 +62,8 @@
 
     btns = new QButtonGroup(this);
     btns->setExclusive(true);
-    connect(btns, QOverload<int>::of(&QButtonGroup::buttonClicked), this, &Sidebar::tabSelected);
+    connect(btns, static_cast<void (QButtonGroup::*)(int)>(&QButtonGroup::buttonClicked),
+            this, &Sidebar::tabSelected);
 
     treeBtn = new QToolButton(this);
     treeBtn->setToolTip(i18n("Tree Panel: a tree view of the local file system"));
diff --git a/krusader/Splitter/splittergui.cpp b/krusader/Splitter/splittergui.cpp
--- a/krusader/Splitter/splittergui.cpp
+++ b/krusader/Splitter/splittergui.cpp
@@ -150,8 +150,10 @@
     KConfigGroup cfg(KSharedConfig::openConfig(), QStringLiteral("Splitter"));
     overwriteCb->setChecked(cfg.readEntry("OverWriteFiles", false));
 
-    connect(sizeCombo, QOverload<int>::of(&QComboBox::activated), this, &SplitterGUI::sizeComboActivated);
-    connect(deviceCombo, QOverload<int>::of(&QComboBox::activated), this, &SplitterGUI::predefinedComboActivated);
+    connect(sizeCombo, static_cast<void (QComboBox::*)(int)>(&QComboBox::activated),
+            this, &SplitterGUI::sizeComboActivated);
+    connect(deviceCombo, static_cast<void (QComboBox::*)(int)>(&QComboBox::activated),
+            this, &SplitterGUI::predefinedComboActivated);
     connect(buttonBox, &QDialogButtonBox::rejected, this, &SplitterGUI::reject);
     connect(buttonBox , &QDialogButtonBox::accepted, this, &SplitterGUI::splitPressed);
 
diff --git a/krusader/UserAction/kraction.cpp b/krusader/UserAction/kraction.cpp
--- a/krusader/UserAction/kraction.cpp
+++ b/krusader/UserAction/kraction.cpp
@@ -284,7 +284,8 @@
         _proc = new KProcess(this);
         _proc->clearProgram(); // this clears the arglist too
         _proc->setWorkingDirectory(workingDir);
-        connect(_proc, QOverload<int, QProcess::ExitStatus>::of(&KProcess::finished), this, &KrActionProc::processExited);
+        connect(_proc, static_cast<void (KProcess::*)(int, QProcess::ExitStatus)>(&KProcess::finished),
+                this, &KrActionProc::processExited);
 
         if (_action->execType() == KrAction::Normal || _action->execType() == KrAction::Terminal) { // not collect output
             if (_action->execType() == KrAction::Terminal) { // run in terminal
diff --git a/krusader/krslots.h b/krusader/krslots.h
--- a/krusader/krslots.h
+++ b/krusader/krslots.h
@@ -45,7 +45,8 @@
     KrProcess(QString in1, QString in2) {
         tmp1 = std::move(in1);
         tmp2 = std::move(in2);
-        connect(this, QOverload<int, QProcess::ExitStatus>::of(&KrProcess::finished), this, &KrProcess::processHasExited);
+        connect(this, static_cast<void (KrProcess::*)(int, QProcess::ExitStatus)>(&KrProcess::finished),
+                this, &KrProcess::processHasExited);
     }
 
 public slots:
diff --git a/krusader/krusader.cpp b/krusader/krusader.cpp
--- a/krusader/krusader.cpp
+++ b/krusader/krusader.cpp
@@ -272,7 +272,7 @@
     //HACK: make sure the active view becomes focused
     // for some reason sometimes the active view cannot be focused immediately at this point,
     // so queue it for the main loop
-    QTimer::singleShot(0, ACTIVE_PANEL->view->widget(), QOverload<>::of(&QWidget::setFocus));
+    QTimer::singleShot(0, ACTIVE_PANEL->view->widget(), static_cast<void (QWidget::*)()>(&QWidget::setFocus));
 
     _openUrlTimer.setSingleShot(true);
     connect(&_openUrlTimer, &QTimer::timeout, this, &Krusader::doOpenUrl);
diff --git a/krusader/panelmanager.cpp b/krusader/panelmanager.cpp
--- a/krusader/panelmanager.cpp
+++ b/krusader/panelmanager.cpp
@@ -63,13 +63,13 @@
     _newTab->setToolTip(i18n("Open a new tab in home"));
     _newTab->setIcon(Icon("tab-new"));
     _newTab->adjustSize();
-    connect(_newTab, &QToolButton::clicked, this, QOverload<>::of(&PanelManager::slotNewTab));
+    connect(_newTab, &QToolButton::clicked, this, static_cast<void (PanelManager::*)()>(&PanelManager::slotNewTab));
 
     // tab-bar
     _tabbar = new PanelTabBar(this, _actions);
     connect(_tabbar, &PanelTabBar::currentChanged, this, &PanelManager::slotCurrentTabChanged);
-    connect(_tabbar, &PanelTabBar::tabCloseRequested, this, QOverload<int>::of(&PanelManager::slotCloseTab));
-    connect(_tabbar, &PanelTabBar::closeCurrentTab, this, QOverload<>::of(&PanelManager::slotCloseTab));
+    connect(_tabbar, &PanelTabBar::tabCloseRequested, this, static_cast<void (PanelManager::*)(int)>(&PanelManager::slotCloseTab));
+    connect(_tabbar, &PanelTabBar::closeCurrentTab, this, static_cast<void (PanelManager::*)()>(&PanelManager::slotCloseTab));
     connect(_tabbar, &PanelTabBar::newTab, this, [=] (const QUrl &url) { slotNewTab(url); });
     connect(_tabbar, &PanelTabBar::draggingTab, this, &PanelManager::slotDraggingTab);
     connect(_tabbar, &PanelTabBar::draggingTabFinished, this, &PanelManager::slotDraggingTabFinished);