now that qt4 was dropped we can use specific ECM/Qt/KF5 version

CMakeLists.txt

@@ -1,14 +1,15 @@
+cmake_minimum_required(VERSION 3.0)
 project(breeze)
 set(PROJECT_VERSION "5.18.80")
 set(PROJECT_VERSION_MAJOR 5)
 
-cmake_minimum_required(VERSION 2.8.12 FATAL_ERROR)
+set(KF5_MIN_VERSION "5.66.0")
 
 include(GenerateExportHeader)
 include(WriteBasicConfigVersionFile)
 include(FeatureSummary)
 
-find_package(ECM 0.0.9 REQUIRED NO_MODULE)
+find_package(ECM ${KF5_MIN_VERSION} REQUIRED NO_MODULE)
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${ECM_MODULE_PATH} ${ECM_KDE_MODULE_DIR} ${CMAKE_SOURCE_DIR}/cmake)
 
 include(ECMInstallIcons)
@@ -36,7 +37,7 @@ if (WITH_WALLPAPERS)
     add_subdirectory(wallpapers)
 endif()
 
-find_package(KF5Package CONFIG REQUIRED)
+find_package(KF5Package ${KF5_MIN_VERSION} CONFIG REQUIRED)
 kpackage_install_package(lookandfeel.dark org.kde.breezedark.desktop look-and-feel plasma)
 if(EXISTS ${CMAKE_SOURCE_DIR}/po AND IS_DIRECTORY ${CMAKE_SOURCE_DIR}/po)
     find_package(KF5I18n CONFIG REQUIRED)