diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8ce562e..66d1301 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,145 +1,145 @@
-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(KDocTools VERSION ${KF5_VERSION})
 
 # ECM setup
 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 ${CMAKE_CURRENT_SOURCE_DIR}/cmake ${ECM_MODULE_PATH} ${ECM_KDE_MODULE_DIR})
 
 
 include(ECMSetupVersion)
 include(ECMMarkNonGuiExecutable)
 include(ECMQtDeclareLoggingCategory)
 include(CMakePackageConfigHelpers)
 include(GenerateExportHeader)
 include(ECMAddQch)
 
 ecm_setup_version(PROJECT VARIABLE_PREFIX KDOCTOOLS
                         VERSION_HEADER "${CMAKE_CURRENT_BINARY_DIR}/kdoctools_version.h"
                         PACKAGE_VERSION_FILE "${CMAKE_BINARY_DIR}/cmake/KF5DocToolsConfigVersion.cmake"
                         SOVERSION 5)
 
 option(MEINPROC_NO_KARCHIVE "Compile meinproc without KArchive dependency. Only for internal usage on KDE infrastructure." OFF)
 option(INSTALL_INTERNAL_TOOLS "Install internal tools too." OFF)
 option(BUILD_QCH "Build API documentation in QCH format (for e.g. Qt Assistant, Qt Creator & KDevelop)" OFF)
 add_feature_info(QCH ${BUILD_QCH} "API documentation in QCH format (for e.g. Qt Assistant, Qt Creator & KDevelop)")
 
 # Dependencies
 set(REQUIRED_QT_VERSION 5.9.0)
 find_package(Qt5Core ${REQUIRED_QT_VERSION} REQUIRED NO_MODULE)
 include(KDEInstallDirs)
 include(KDEFrameworkCompilerSettings NO_POLICY_SCOPE)
 include(KDECMakeSettings)
 
 # KF5 frameworks
 if (NOT MEINPROC_NO_KARCHIVE)
    find_package(KF5Archive ${KF5_DEP_VERSION} REQUIRED)
 else()
    message(WARNING "KArchive dependency has been disabled. This should be done only for internal usage on KDE infrastructure.")
 endif()
 
 find_package(KF5I18n ${KF5_DEP_VERSION})
 set_package_properties(KF5I18n PROPERTIES TYPE OPTIONAL
    PURPOSE "Required to build the KDocTools translations")
 
 find_package(LibXslt)
 set_package_properties(LibXslt PROPERTIES
                        URL "http://xmlsoft.org/XSLT"
                        TYPE REQUIRED
                        PURPOSE "Required by the KDE help system to process DocBook XML"
                       )
 
 find_package(LibXml2)
 set_package_properties(LibXml2 PROPERTIES
                        URL "http://xmlsoft.org"
                        TYPE REQUIRED
                        PURPOSE "Required by the KDE help system to process DocBook XML"
                       )
 
 if (NOT LIBXML2_XMLLINT_EXECUTABLE)
    message(FATAL_ERROR "xmllint is required to process DocBook XML")
 endif()
 
 find_package(DocBookXML4 "4.5")
 
 set_package_properties(DocBookXML4 PROPERTIES
                        TYPE REQUIRED
                        PURPOSE "Required by the KDE help system to process DocBook XML"
                       )
 
 find_package(DocBookXSL)
 set_package_properties(DocBookXSL PROPERTIES
                        TYPE REQUIRED
                        PURPOSE "Required by the KDE help system to process DocBook XML"
                       )
 
 remove_definitions(-DQT_NO_CAST_FROM_ASCII)
 
 set(_kdoctoolsBootStrapping TRUE)
 set(KDOCTOOLS_CUSTOMIZATION_DIR "${CMAKE_CURRENT_BINARY_DIR}/src/customization/")
 if (WIN32)
     set(KDOCTOOLS_MEINPROC_EXECUTABLE          ${EXECUTABLE_OUTPUT_PATH}/${CMAKE_CFG_INTDIR}/meinproc5 )
 else ()
     set(KDOCTOOLS_MEINPROC_EXECUTABLE          ${CMAKE_CURRENT_BINARY_DIR}/src/meinproc5${CMAKE_EXECUTABLE_SUFFIX} )
 endif ()
 include(KF5DocToolsMacros.cmake)
 
 set(KDOCTOOLS_LANGUAGES_LIST af bg ca cs da de el en-GB en eo es et fi fo fr gl he hu id it ja ko lt nds nl nn no pl pt-BR pt ro ru sk sl sr sr@latin sr@ijekavian sr@ijekavianlatin sv th tr uk wa xh xx zh-CN zh-TW)
 
 set(CMAKECONFIG_INSTALL_DIR "${KDE_INSTALL_CMAKEPACKAGEDIR}/KF5DocTools")
 add_definitions(-DTRANSLATION_DOMAIN=\"kdoctools5\")
 #add_definitions(-DQT_DISABLE_DEPRECATED_BEFORE=0x060000)
 if (IS_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/po" AND KF5I18n_FOUND)
     ki18n_install(po)
     kdoctools_install(po)
 endif()
 add_subdirectory(common)
 add_subdirectory(docs)
 add_subdirectory(src)
 if (BUILD_TESTING)
     add_subdirectory(autotests)
 endif()
 
 install(EXPORT KF5DocToolsTargets DESTINATION "${CMAKECONFIG_INSTALL_DIR}" FILE KF5DocToolsTargets.cmake NAMESPACE KF5:: )
 
 if (BUILD_QCH)
     ecm_install_qch_export(
         TARGETS KF5DocTools_QCH
         FILE "${CMAKE_BINARY_DIR}/cmake/KF5DocToolsQchTargets.cmake"
         DESTINATION "${CMAKECONFIG_INSTALL_DIR}"
         COMPONENT Devel
     )
     set(PACKAGE_INCLUDE_QCHTARGETS "include(\"\${CMAKE_CURRENT_LIST_DIR}/KF5DocToolsQchTargets.cmake\")")
 endif()
 
 configure_package_config_file(
   "${CMAKE_CURRENT_SOURCE_DIR}/KF5DocToolsConfig.cmake.in"
   "${CMAKE_BINARY_DIR}/cmake/KF5DocToolsConfig.cmake"
   PATH_VARS
     KDE_INSTALL_DATADIR_KF5
   INSTALL_DESTINATION  ${CMAKECONFIG_INSTALL_DIR}
 )
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/KF5DocToolsMacros.cmake ${CMAKE_BINARY_DIR}/cmake/KF5DocToolsMacros.cmake COPYONLY)
 # we need a separate copy with local pathes for install autotests
 export(EXPORT KF5DocToolsTargets FILE ${CMAKE_BINARY_DIR}/cmake/KF5DocToolsTargets.cmake NAMESPACE KF5::)
 
 install(FILES
   "${CMAKE_BINARY_DIR}/cmake/KF5DocToolsConfig.cmake"
   "${CMAKE_BINARY_DIR}/cmake/KF5DocToolsConfigVersion.cmake"
   DESTINATION "${CMAKECONFIG_INSTALL_DIR}"
   COMPONENT Devel
 )
 
 configure_file(config-kdoctools.h.cmake ${CMAKE_CURRENT_BINARY_DIR}/config-kdoctools.h )
 
 install( FILES
     KF5DocToolsMacros.cmake
     DESTINATION ${CMAKECONFIG_INSTALL_DIR} COMPONENT Devel )
 
 feature_summary(WHAT ALL FATAL_ON_MISSING_REQUIRED_PACKAGES)