Trying to build Falkon, I get this error:

[ 89%] Building CXX object autotests/CMakeFiles/adblocktest.dir/qrc_autotests.cpp.o
/srcbuild/falkon/src/plugins/KDEFrameworksIntegration/kdeframeworksintegrationplugin.cpp: In constructor ‘KDEFrameworksIntegrationPlugin::KDEFrameworksIntegrationPlugin()’:
/srcbuild/falkon/src/plugins/KDEFrameworksIntegration/kdeframeworksintegrationplugin.cpp:43:45: error: no matching function for call to ‘Purpose::Menu::Menu(KDEFrameworksIntegrationPlugin*)’
     , m_sharePageMenu(new Purpose::Menu(this))
                                             ^
In file included from /opt/include/KF5/purposewidgets/PurposeWidgets/Menu:1,
                 from /srcbuild/falkon/src/plugins/KDEFrameworksIntegration/kdeframeworksintegrationplugin.h:22,
                 from /srcbuild/falkon/src/plugins/KDEFrameworksIntegration/kdeframeworksintegrationplugin.cpp:18:
/opt/include/KF5/purposewidgets/purposewidgets/menu.h:35:14: note: candidate: ‘Purpose::Menu::Menu(QWidget*)’
     explicit Menu(QWidget* parent = nullptr);
              ^~~~
/opt/include/KF5/purposewidgets/purposewidgets/menu.h:35:14: note:   no known conversion for argument 1 from ‘KDEFrameworksIntegrationPlugin*’ to ‘QWidget*’
/srcbuild/falkon/src/plugins/KDEFrameworksIntegration/kdeframeworksintegrationplugin.cpp: In member function ‘virtual void KDEFrameworksIntegrationPlugin::populateWebViewMenu(QMenu*, WebView*, const WebHitTestResult&)’:
/srcbuild/falkon/src/plugins/KDEFrameworksIntegration/kdeframeworksintegrationplugin.cpp:104:57: error: no matching function for call to ‘QJsonValue::QJsonValue(QUrl)’
         { QStringLiteral("urls"), QJsonValue(view->url()) },
                                                         ^
In file included from /opt/include/QtCore/qjsonobject.h:43,
                 from /opt/include/QtCore/qplugin.h:45,
                 from /opt/include/QtCore/QtPlugin:1,
                 from /srcbuild/falkon/src/lib/plugins/plugininterface.h:21,
                 from /srcbuild/falkon/src/plugins/KDEFrameworksIntegration/kdeframeworksintegrationplugin.h:20,
                 from /srcbuild/falkon/src/plugins/KDEFrameworksIntegration/kdeframeworksintegrationplugin.cpp:18:
/opt/include/QtCore/qjsonvalue.h:156:5: note: candidate: ‘QJsonValue::QJsonValue(QJsonPrivate::Data*, QJsonPrivate::Base*, const QJsonPrivate::Value&)’
     QJsonValue(QJsonPrivate::Data *d, QJsonPrivate::Base *b, const QJsonPrivate::Value& v);
     ^~~~~~~~~~


Let me know if more info is needed?