Use find_package function to find the KF version

CMakeLists.txt

@@ -3,10 +3,8 @@ cmake_minimum_required(VERSION 3.20)
 project(kwin4_effect_shapecorners VERSION 0.6.2 LANGUAGES CXX)
 
 include(cmake/default-vars.cmake)
-include(cmake/qtversion.cmake)
-include(cmake/info.cmake)
 
-find_package(ECM ${KF_MIN_VERSION} REQUIRED NO_MODULE)
+find_package(ECM REQUIRED NO_MODULE)
 set(CMAKE_MODULE_PATH
         ${CMAKE_MODULE_PATH}
         ${ECM_MODULE_PATH}
@@ -17,14 +15,20 @@ include(KDEInstallDirs)
 include(KDECMakeSettings)
 include(KDECompilerSettings NO_POLICY_SCOPE)
 
+include(cmake/qtversion.cmake)
+
 # required frameworks by Core
 find_package(KF${QT_MAJOR_VERSION} ${KF_MIN_VERSION} REQUIRED COMPONENTS ConfigWidgets)
+
 if(${QT_MAJOR_VERSION} EQUAL 6)
     find_package(KF${QT_MAJOR_VERSION} ${KF_MIN_VERSION} REQUIRED COMPONENTS KCMUtils)
-    find_package(KWin REQUIRED COMPONENTS kwineffects)
+    find_package(KWin ${KF_MIN_VERSION} REQUIRED COMPONENTS kwineffects)
+    message(STATUS "Found KWin Version: ${KWin_VERSION}")
 else()
-    find_package(KWinEffects REQUIRED COMPONENTS kwineffects kwinglutils)
+    find_package(KWinEffects ${KF_MIN_VERSION} REQUIRED COMPONENTS kwineffects kwinglutils)
+    message(STATUS "Found KWin Version: ${KWinEffects_VERSION}")
 endif ()
+include(cmake/info.cmake)
 find_package(epoxy REQUIRED)
 find_package(XCB REQUIRED COMPONENTS XCB)
 find_package(KWinDBusInterface CONFIG REQUIRED)

cmake/info.cmake

@@ -1,4 +1,4 @@
-if(${QT_MAJOR_VERSION} EQUAL 6)
+if(${KWin_VERSION_MAJOR} EQUAL 6)
     set(KWIN_EFFECT_INCLUDE_FILE "/usr/include/kwin/effect/effect.h")
 else ()
     set(KWIN_EFFECT_INCLUDE_FILE "/usr/include/kwineffects.h")
@@ -7,4 +7,18 @@ execute_process(
         COMMAND sh -c "grep '#define KWIN_EFFECT_API_VERSION_MINOR' ${KWIN_EFFECT_INCLUDE_FILE} | awk '{print \$NF}'"
         OUTPUT_VARIABLE KWIN_EFFECT_API_VERSION_MINOR OUTPUT_STRIP_TRAILING_WHITESPACE
 )
-message("-- KWinEffect Version: ${KWIN_EFFECT_API_VERSION_MINOR}")
+message(STATUS "Found KWinEffect API Version: ${KWIN_EFFECT_API_VERSION_MINOR}")
+
+#below is a very useful way of finding variables and contains:
+
+#get_cmake_property(_variableNames VARIABLES)
+#list (SORT _variableNames)
+#foreach (_variableName ${_variableNames})
+#    string(TOLOWER "${_variableName}" KEY)
+#    string(TOLOWER "${${_variableName}}" VALUE)
+#    string(FIND "${KEY}" "kwin" INDEX1)
+#    string(FIND "${VALUE}" "kwin" INDEX2)
+#    if (${INDEX1} GREATER -1 OR ${INDEX2} GREATER -1)
+#        message(STATUS "VARIABLE ${_variableName}=${${_variableName}}")
+#    endif ()
+#endforeach()

cmake/qtversion.cmake

@@ -1,15 +1,11 @@
-execute_process(
-        COMMAND sh -c "ldconfig -v 2>&1 | grep libkwin.so | rev | cut -d '.' -f -3 | rev"
-        OUTPUT_VARIABLE KWIN_VERSION OUTPUT_STRIP_TRAILING_WHITESPACE
-)
-message("-- KWin Version: ${KWIN_VERSION}")
+find_package(KF6 COMPONENTS ConfigWidgets)
 
-set(KF_MIN_VERSION "5.78")
-set(QT_MIN_VERSION "5.15")
-set(QT_MAJOR_VERSION 5)
-
-if(KWIN_VERSION VERSION_GREATER "6")
+if(KF6_FOUND)
     set(QT_MIN_VERSION "6.4.0")
     set(QT_MAJOR_VERSION 6)
     set(KF_MIN_VERSION 6)
-endif()
+else(KF6_FOUND)
+    set(QT_MIN_VERSION "5.15")
+    set(QT_MAJOR_VERSION 5)
+    set(KF_MIN_VERSION "5.78")
+endif (KF6_FOUND)