Adapt build system for building against qt6

CMakeLists.txt

@@ -9,7 +9,7 @@ set(RELEASE_SERVICE_VERSION "${RELEASE_SERVICE_VERSION_MAJOR}.${RELEASE_SERVICE_
 project(kolf VERSION ${RELEASE_SERVICE_VERSION})
 
 set (QT_MIN_VERSION "5.15.0")
-set (KF5_MIN_VERSION "5.89.0")
+set (KF5_MIN_VERSION "5.90.0")
 
 find_package(ECM ${KF5_MIN_VERSION} REQUIRED CONFIG)
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${ECM_MODULE_PATH})
@@ -23,7 +23,8 @@ include(ECMInstallIcons)
 include(ECMSetupVersion)
 include(FeatureSummary)
 
-find_package(Qt5 ${QT_MIN_VERSION} REQUIRED NO_MODULE COMPONENTS Gui Widgets)
+find_package(Qt${QT_MAJOR_VERSION} ${QT_MIN_VERSION} REQUIRED NO_MODULE COMPONENTS Gui Widgets)
+find_package(Qt${QT_MAJOR_VERSION}QuickWidgets ${REQUIRED_QT_VERSION} CONFIG)
 find_package(KF5 ${KF5_MIN_VERSION} REQUIRED COMPONENTS
     Completion
     Config
@@ -204,8 +205,8 @@ target_link_libraries(kolfprivate
     KF5::KIOCore
     KF5::TextWidgets
     KF5::XmlGui
-    Qt::Gui
-    Qt::Widgets
+    Qt${QT_MAJOR_VERSION}::Gui
+    Qt${QT_MAJOR_VERSION}::Widgets
 )
 
 ########### next target ###############
@@ -222,7 +223,7 @@ install(TARGETS kolf  ${KDE_INSTALL_TARGETS_DEFAULT_ARGS})
 ########### install files ###############
 
 install(PROGRAMS org.kde.kolf.desktop  DESTINATION  ${KDE_INSTALL_APPDIR})
-install(FILES kolfui.rc DESTINATION ${KDE_INSTALL_KXMLGUI5DIR}/kolf)
+install(FILES kolfui.rc DESTINATION ${KDE_INSTALL_KXMLGUIDIR}/kolf)
 install(FILES intro tutorial.kolf tutorial.kolfgame  DESTINATION  ${KDE_INSTALL_DATADIR}/kolf)
 #install(FILES ball.h game.h statedb.h config.h canvasitem.h object.h rtti.h vector.h floater.h slope.h  DESTINATION  ${KDE_INSTALL_INCLUDEDIR}/kolf COMPONENT Devel)
 install(FILES org.kde.kolf.appdata.xml DESTINATION ${KDE_INSTALL_METAINFODIR})