diff --git a/CMakeLists.txt b/CMakeLists.txt
index c967812..251102c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,119 +1,119 @@
-cmake_minimum_required(VERSION 3.0)
+cmake_minimum_required(VERSION 3.5)
 
 set(KF5_VERSION "5.53.0") # handled by release scripts
 set(KF5_DEP_VERSION "5.53.0") # handled by release scripts
 project(KDesignerPlugin VERSION ${KF5_VERSION})
 
 include(FeatureSummary)
 find_package(ECM 5.53.0  NO_MODULE)
 set_package_properties(ECM PROPERTIES TYPE REQUIRED DESCRIPTION "Extra CMake Modules." URL "https://projects.kde.org/projects/kdesupport/extra-cmake-modules")
 feature_summary(WHAT REQUIRED_PACKAGES_NOT_FOUND FATAL_ON_MISSING_REQUIRED_PACKAGES)
 
 
 set(CMAKE_MODULE_PATH ${ECM_MODULE_PATH} ${ECM_KDE_MODULE_DIR})
 
 include(KDEInstallDirs)
 include(KDEFrameworkCompilerSettings NO_POLICY_SCOPE)
 include(KDECMakeSettings)
 
 
 set(REQUIRED_QT_VERSION 5.9.0)
 find_package(Qt5Core ${REQUIRED_QT_VERSION} REQUIRED NO_MODULE)
 find_package(Qt5Designer ${REQUIRED_QT_VERSION} NO_MODULE)
 set_package_properties(Qt5Designer PROPERTIES
    PURPOSE "Required to build the Qt Designer plugins"
    TYPE OPTIONAL
 )
 
 include(ECMPoQmTools)
 
 find_package(KF5CoreAddons ${KF5_DEP_VERSION} REQUIRED)
 find_package(KF5Config ${KF5_DEP_VERSION} REQUIRED)
 find_package(KF5DocTools ${KF5_DEP_VERSION})
 
 find_package(KF5Completion ${KF5_DEP_VERSION})
 set_package_properties(KF5Completion PROPERTIES TYPE OPTIONAL
    PURPOSE "Required to build the Qt Designer plugin for KDE Frameworks widgets")
 
 find_package(KF5ConfigWidgets ${KF5_DEP_VERSION})
 set_package_properties(KF5ConfigWidgets PROPERTIES TYPE OPTIONAL
    PURPOSE "Required to build the Qt Designer plugin for KDE Frameworks widgets")
 
 find_package(KF5IconThemes ${KF5_DEP_VERSION})
 set_package_properties(KF5IconThemes PROPERTIES TYPE OPTIONAL
    PURPOSE "Required to build the Qt Designer plugin for KDE Frameworks widgets")
 
 find_package(KF5KIO ${KF5_DEP_VERSION})
 set_package_properties(KF5KIO PROPERTIES TYPE OPTIONAL
    PURPOSE "Required to build the Qt Designer plugin for KDE Frameworks widgets")
 
 find_package(KF5ItemViews ${KF5_DEP_VERSION})
 set_package_properties(KF5ItemViews PROPERTIES TYPE OPTIONAL
    PURPOSE "Required to build the Qt Designer plugin for KDE Frameworks widgets")
 
 find_package(KF5Plotting ${KF5_DEP_VERSION})
 set_package_properties(KF5Plotting PROPERTIES TYPE OPTIONAL
    PURPOSE "Required to build the Qt Designer plugin for KDE Frameworks widgets")
 
 find_package(KF5TextWidgets ${KF5_DEP_VERSION})
 set_package_properties(KF5TextWidgets PROPERTIES TYPE OPTIONAL
    PURPOSE "Required to build the Qt Designer plugin for KDE Frameworks widgets")
 
 find_package(KF5WidgetsAddons ${KF5_DEP_VERSION})
 set_package_properties(KF5WidgetsAddons PROPERTIES TYPE OPTIONAL
    PURPOSE "Required to build the Qt Designer plugin for KDE Frameworks widgets")
 
 find_package(KF5XmlGui ${KF5_DEP_VERSION})
 set_package_properties(KF5XmlGui PROPERTIES TYPE OPTIONAL
    PURPOSE "Required to build the Qt Designer plugin for KDE Frameworks widgets")
 
 find_package(KF5Sonnet ${KF5_DEP_VERSION})
 set_package_properties(KF5Sonnet PROPERTIES TYPE OPTIONAL
    PURPOSE "Required to build the Qt Designer plugin for KDE Frameworks widgets")
 
 find_package(KF5WebKit ${KF5_DEP_VERSION})
 set_package_properties(KF5WebKit PROPERTIES TYPE OPTIONAL
    PURPOSE "Required to build the Qt Designer plugin for the KDEWebKit widgets")
 
 if(Qt5Designer_FOUND AND KF5Completion_FOUND AND KF5ConfigWidgets_FOUND AND
   KF5IconThemes_FOUND AND KF5KIO_FOUND AND KF5ItemViews_FOUND AND KF5Plotting_FOUND
   AND KF5TextWidgets_FOUND AND KF5WidgetsAddons_FOUND AND KF5XmlGui_FOUND AND KF5Sonnet_FOUND)
     set(BUILD_KF5_DESIGNER_PLUGIN TRUE)
 endif()
 
 if(Qt5Designer_FOUND AND KF5WebKit_FOUND)
   set(BUILD_KDEWEBKIT_DESIGNER_PLUGIN TRUE)
 endif()
 
 remove_definitions(-DQT_NO_CAST_FROM_ASCII)
 
 set(CMAKECONFIG_INSTALL_DIR "${KDE_INSTALL_CMAKEPACKAGEDIR}/KF5DesignerPlugin")
 
 if (KF5DocTools_FOUND)
     add_subdirectory(docs)
 endif()
 if (IS_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/po")
     ecm_install_po_files_as_qm(po)
     if (KF5DocTools_FOUND)
         kdoctools_install(po)
     endif()
 endif()
 
 add_subdirectory(src)
 if (BUILD_TESTING)
     add_subdirectory(autotests)
 endif()
 
 include(ECMSetupVersion)
 ecm_setup_version(PROJECT VARIABLE_PREFIX kf5designerplugin
                                  VERSION_HEADER "${CMAKE_CURRENT_BINARY_DIR}/kf5designerplugin_version.h"
                                  PACKAGE_VERSION_FILE "${CMAKE_CURRENT_BINARY_DIR}/KF5DesignerPluginConfigVersion.cmake"
                                  SOVERSION 5)
 
 install( FILES
     KF5DesignerPluginMacros.cmake KF5DesignerPluginConfig.cmake "${CMAKE_CURRENT_BINARY_DIR}/KF5DesignerPluginConfigVersion.cmake"
     DESTINATION ${CMAKECONFIG_INSTALL_DIR} COMPONENT Devel )
 
 install(EXPORT KF5DesignerPluginTargets DESTINATION "${CMAKECONFIG_INSTALL_DIR}" FILE KF5DesignerPluginTargets.cmake NAMESPACE KF5:: )
 
 feature_summary(WHAT ALL   FATAL_ON_MISSING_REQUIRED_PACKAGES)