diff --git a/CMakeLists.txt b/CMakeLists.txt
index c25a94ff..da3d2c72 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,129 +1,129 @@
 # vim: set expandtab shiftwidth=4 softtabstop=4:
 
 project(kajongg)
 
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required (VERSION 3.5)
 set(PYTHON_MIN_VERSION "3.5.0")
 set(QT_MIN_VERSION "5.2")
 set(KF5_MIN_VERSION "5.15.0")
 set(TWISTED_MIN_VERSION "16.6.0")
 
 find_package(ECM 1.2.0 REQUIRED NO_MODULE)
     
 set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake-modules ${ECM_MODULE_PATH} ${ECM_KDE_MODULE_DIR})
 
 find_package(PythonInterp ${PYTHON_MIN_VERSION} REQUIRED)
 find_package(Twisted ${TWISTED_MIN_VERSION} REQUIRED)
 find_package(Qt5 ${QT_MIN_VERSION} REQUIRED NO_MODULE COMPONENTS Core Gui Svg Widgets)
 find_package(KF5 ${KF5_MIN_VERSION} REQUIRED COMPONENTS Config DocTools)
 
 include(FeatureSummary)
 include(ECMPackageConfigHelpers)
 include(ECMSetupVersion)
 include(KDEInstallDirs)
 include(ECMInstallIcons)
 include(KDECMakeSettings)
 
 include(FindPythonInterp)
 
 include(KDEPython)
 
 set(PROJECT_NAME kajongg)
 
 add_subdirectory( voices )
 add_subdirectory( doc )
 add_subdirectory( icons )
 
 set(SRCFILES
     src/permutations.py
     src/about.py
     src/animation.py
     src/mjresource.py
     src/background.py
     src/backgroundselector.py
     src/board.py
     src/chat.py
     src/handboard.py
     src/message.py
     src/client.py
     src/intelligence.py
     src/altint.py
     src/common.py
     src/wind.py
     src/rand.py
     src/config.py
     src/kdestub.py
     src/deferredutil.py
     src/differ.py
     src/meld.py
     src/player.py
     src/game.py
     src/games.py
     src/genericdelegates.py
     src/guiutil.py
     src/humanclient.py
     src/mi18n.py
     src/login.py
     src/kde.py
     src/dialogs.py
     src/mainwindow.py
     src/move.py
     src/modeltest.py
     src/playerlist.py
     src/predefined.py
     src/qtreactor.py
     src/query.py
     src/rulesetselector.py
     src/hand.py
     src/rule.py
     src/rulecode.py
     src/scene.py
     src/scoringdialog.py
     src/scoring.py
     src/user.py
     src/servertable.py
     src/servercommon.py
     src/server.py
     src/sound.py
     src/tables.py
     src/tile.py
     src/uitile.py
     src/tileset.py
     src/tilesetselector.py
     src/tree.py
     src/statesaver.py
     src/wall.py
     src/uiwall.py
     src/visible.py
     src/log.py
     src/qt.py
     src/configdialog.py
     src/tilesource.py
     src/util.py)
 
 set(DATAFILES
     src/tilesetselector.ui
     src/backgroundselector.ui
     src/kajonggui.rc)
 
 find_package(KF5KMahjongglib REQUIRED)
 
 # In KDE4, this was done with PYKDE4_INSTALL_PYTHON_FILES and PYKDE4_ADD_EXECUTABLE
 # because including PYKDE4 does not seem appropriate when not using PYKDE4 bindings,
 # I expanded those macros, reducing to what we actually need. No Windows support here yet.
 # Those macros come from ./cmake-modules/KDEPython.cmake
 
 
 configure_file(src/kdepaths.py.in src/kdepaths.py)
 
 KDE_INSTALL_PYTHON_FILES(${SRCFILES} src/kajongg.py src/kajonggserver.py)
 KDE_INSTALL_PYTHON_FILES(${CMAKE_CURRENT_BINARY_DIR}/src/kdepaths.py)
 KDE_ADD_PYTHON_EXECUTABLE(kajongg.py kajongg)
 KDE_ADD_PYTHON_EXECUTABLE(kajonggserver.py kajonggserver)
 
 install(FILES ${DATAFILES} DESTINATION ${DATA_INSTALL_DIR}/kajongg)
 
 install(PROGRAMS org.kde.kajongg.desktop DESTINATION ${KDE_INSTALL_APPDIR})
 install(FILES org.kde.kajongg.appdata.xml DESTINATION ${KDE_INSTALL_METAINFODIR})
 
 feature_summary(WHAT ALL INCLUDE_QUIET_PACKAGES FATAL_ON_MISSING_REQUIRED_PACKAGES)