Increase version + use qt_ macro + Qt::

CMakeLists.txt

-cmake_minimum_required(VERSION 3.5)
+cmake_minimum_required(VERSION 3.16)
 
 # KDE Application Version, managed by release script
 set(RELEASE_SERVICE_VERSION_MAJOR "21")
@@ -17,7 +17,7 @@ endif(NOT MSVC)
 include(FeatureSummary)
 find_package(Qt5 CONFIG REQUIRED Core Widgets PrintSupport)
 
-find_package(ECM 1.7.0 NO_MODULE REQUIRED)
+find_package(ECM 5.83.0 NO_MODULE REQUIRED)
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${ECM_MODULE_PATH} )
 
 include(KDEInstallDirs)

src/CMakeLists.txt

@@ -73,9 +73,9 @@ ecm_add_app_icon(kwordquiz_SRCS ICONS ${ICONS_SRCS})
 add_executable(kwordquiz ${kwordquiz_SRCS})
 
 target_link_libraries(kwordquiz
-    Qt5::Core
-    Qt5::PrintSupport
-    Qt5::Widgets
+    Qt::Core
+    Qt::PrintSupport
+    Qt::Widgets
     KF5::Crash
     KF5::ConfigCore
     KF5::I18n