Split KDEInstallDirs into a 5 and a 6 variant

This factors out large parts of the common code into separate modules,
and adds a backward compatibility wrapper.

The 6 variant drops some deprecated variables where possible, but otherwise
is the same as the 5 variant. It still lacks a replacement for the paths
depending on ECMQueryQMake though.

8 files changed, 1152 insertions, 727 deletions

diff --git a/docs/kde-module/KDEInstallDirs5.rst b/docs/kde-module/KDEInstallDirs5.rst
new file mode 100644
index 00000000..4d446f07
--- /dev/null
+++ b/docs/kde-module/KDEInstallDirs5.rst
@@ -0,0 +1 @@
+.. ecm-module:: ../../kde-modules/KDEInstallDirs5.cmake
diff --git a/docs/kde-module/KDEInstallDirs6.rst b/docs/kde-module/KDEInstallDirs6.rst
new file mode 100644
index 00000000..db40cdde
--- /dev/null
+++ b/docs/kde-module/KDEInstallDirs6.rst
@@ -0,0 +1 @@
+.. ecm-module:: ../../kde-modules/KDEInstallDirs6.cmake
diff --git a/kde-modules/KDEInstallDirs.cmake b/kde-modules/KDEInstallDirs.cmake
index 5b11a424..5dbf97d9 100644
--- a/kde-modules/KDEInstallDirs.cmake
+++ b/kde-modules/KDEInstallDirs.cmake
@@ -1,9 +1,4 @@
-# SPDX-FileCopyrightText: 2014-2015 Alex Merry <alex.merry@kde.org>
-# SPDX-FileCopyrightText: 2013 Stephen Kelly <steveire@gmail.com>
-# SPDX-FileCopyrightText: 2012 David Faure <faure@kde.org>
-# SPDX-FileCopyrightText: 2007 Matthias Kretz <kretz@kde.org>
-# SPDX-FileCopyrightText: 2006-2007 Laurent Montel <montel@kde.org>
-# SPDX-FileCopyrightText: 2006-2013 Alex Neundorf <neundorf@kde.org>
+# SPDX-FileCopyrightText: 2021 Volker Krause <vkrause@kde.org>
 #
 # SPDX-License-Identifier: BSD-3-Clause
 
@@ -11,727 +6,10 @@
 KDEInstallDirs
 --------------
 
-Define KDE standard installation directories.
+Compatibility wrapper around KDEInstallDirs5.
 
-Note that none of the variables defined by this module provide any
-information about the location of already-installed KDE software.
-
-Also sets ``CMAKE_INSTALL_PREFIX`` to the installation prefix of ECM,
-unless that variable has been already explicitly set by something else
-(since 5.61 and with CMake >= 3.7).
-
-Inclusion of this module defines the following variables:
-
-``KDE_INSTALL_<dir>``
-    destination for files of a given type
-``KDE_INSTALL_FULL_<dir>``
-    corresponding absolute path
-
-where ``<dir>`` is one of (default values in parentheses and alternative,
-deprecated variable name in square brackets):
-
-``BUNDLEDIR``
-    application bundles (``/Applications/KDE``) [``BUNDLE_INSTALL_DIR``]
-``EXECROOTDIR``
-    executables and libraries (``<empty>``) [``EXEC_INSTALL_PREFIX``]
-``BINDIR``
-    user executables (``EXECROOTDIR/bin``) [``BIN_INSTALL_DIR``]
-``SBINDIR``
-    system admin executables (``EXECROOTDIR/sbin``) [``SBIN_INSTALL_DIR``]
-``LIBDIR``
-    object code libraries (``EXECROOTDIR/lib``, ``EXECROOTDIR/lib64`` or
-    ``EXECROOTDIR/lib/<multiarch-tuple`` on Debian) [``LIB_INSTALL_DIR``]
-``LIBEXECDIR``
-    executables for internal use by programs and libraries (``BINDIR`` on
-    Windows, ``LIBDIR/libexec`` otherwise) [``LIBEXEC_INSTALL_DIR``]
-``CMAKEPACKAGEDIR``
-    CMake packages, including config files (``LIBDIR/cmake``)
-    [``CMAKECONFIG_INSTALL_PREFIX``]
-``QTPLUGINDIR``
-    Qt plugins (``LIBDIR/plugins`` or qmake-qt5's ``QT_INSTALL_PLUGINS``) [``QT_PLUGIN_INSTALL_DIR``]
-``PLUGINDIR``
-    Plugins (``QTPLUGINDIR``) [``PLUGIN_INSTALL_DIR``]
-``QTQUICKIMPORTSDIR``
-    QtQuick1 imports (``QTPLUGINDIR/imports`` or qmake-qt5's ``QT_INSTALL_IMPORTS``) [``IMPORTS_INSTALL_DIR``]
-``QMLDIR``
-    QtQuick2 imports (``LIBDIR/qml`` or qmake-qt5's ``QT_INSTALL_QML``) [``QML_INSTALL_DIR``]
-``INCLUDEDIR``
-    C and C++ header files (``include``) [``INCLUDE_INSTALL_DIR``]
-``LOCALSTATEDIR``
-    modifiable single-machine data (``var``)
-``SHAREDSTATEDIR``
-    modifiable architecture-independent data (``com``)
-``DATAROOTDIR``
-    read-only architecture-independent data root (``share``)
-    [``SHARE_INSTALL_PREFIX``]
-``DATADIR``
-    read-only architecture-independent data (``DATAROOTDIR``)
-    [``DATA_INSTALL_DIR``]
-``DOCBUNDLEDIR``
-    documentation bundles generated using kdoctools
-    (``DATAROOTDIR/doc/HTML``) [``HTML_INSTALL_DIR``]
-``KCFGDIR``
-    kconfig description files (``DATAROOTDIR/config.kcfg``)
-    [``KCFG_INSTALL_DIR``]
-``KCONFUPDATEDIR``
-    kconf_update scripts (``DATAROOTDIR/kconf_update``)
-    [``KCONF_UPDATE_INSTALL_DIR``]
-``KSERVICES5DIR``
-    services for KDE Frameworks 5 (``DATAROOTDIR/kservices5``)
-    [``SERVICES_INSTALL_DIR``]
-``KSERVICETYPES5DIR``
-    service types for KDE Frameworks 5 (``DATAROOTDIR/kservicetypes5``)
-    [``SERVICETYPES_INSTALL_DIR``]
-``KXMLGUI5DIR``
-    knotify description files (``DATAROOTDIR/kxmlgui5``)
-    [``KXMLGUI_INSTALL_DIR``]
-``KTEMPLATESDIR``
-    Kapptemplate and Kdevelop templates (``kdevappwizard/templates``)
-``KNOTIFY5RCDIR``
-    knotify description files (``DATAROOTDIR/knotifications5``)
-    [``KNOTIFYRC_INSTALL_DIR``]
-``ICONDIR``
-    icons (``DATAROOTDIR/icons``) [``ICON_INSTALL_DIR``]
-``LOCALEDIR``
-    knotify description files (``DATAROOTDIR/locale``)
-    [``LOCALE_INSTALL_DIR``]
-``SOUNDDIR``
-    sound files (``DATAROOTDIR/sounds``) [``SOUND_INSTALL_DIR``]
-``TEMPLATEDIR``
-    templates (``DATAROOTDIR/templates``) [``TEMPLATES_INSTALL_DIR``]
-``WALLPAPERDIR``
-    desktop wallpaper images (``DATAROOTDIR/wallpapers``)
-    [``WALLPAPER_INSTALL_DIR``]
-``APPDIR``
-    application desktop files (``DATAROOTDIR/applications``) Since 1.1.0.
-    [``XDG_APPS_INSTALL_DIR``]
-``DESKTOPDIR``
-    desktop directories (``DATAROOTDIR/desktop-directories``)
-    [``XDG_DIRECTORY_INSTALL_DIR``]
-``MIMEDIR``
-    mime description files (``DATAROOTDIR/mime/packages``)
-    [``XDG_MIME_INSTALL_DIR``]
-``METAINFODIR``
-    AppStream component metadata files (``DATAROOTDIR/metainfo``)
-``QTQCHDIR``
-    documentation bundles in QCH format for Qt-extending libraries (``DATAROOTDIR/doc/qch`` or qmake-qt5's ``QT_INSTALL_DOCS``) Since 5.36.0.
-``QCHDIR``
-    documentation bundles in QCH format (``DATAROOTDIR/doc/qch``) Since 5.36.0.
-``MANDIR``
-    man documentation (``DATAROOTDIR/man``) [``MAN_INSTALL_DIR``]
-``INFODIR``
-    info documentation (``DATAROOTDIR/info``)
-``DBUSDIR``
-    D-Bus (``DATAROOTDIR/dbus-1``)
-``DBUSINTERFACEDIR``
-    D-Bus interfaces (``DBUSDIR/interfaces``)
-    [``DBUS_INTERFACES_INSTALL_DIR``]
-``DBUSSERVICEDIR``
-    D-Bus session services (``DBUSDIR/services``)
-    [``DBUS_SERVICES_INSTALL_DIR``]
-``DBUSSYSTEMSERVICEDIR``
-    D-Bus system services (``DBUSDIR/system-services``)
-    [``DBUS_SYSTEM_SERVICES_INSTALL_DIR``]
-``SYSCONFDIR``
-    read-only single-machine data
-    (``etc``, or ``/etc`` if ``CMAKE_INSTALL_PREFIX`` is ``/usr``)
-    [``SYSCONF_INSTALL_DIR``]
-``CONFDIR``
-    application configuration files (``SYSCONFDIR/xdg``)
-    [``CONFIG_INSTALL_DIR``]
-``AUTOSTARTDIR``
-    autostart files (``CONFDIR/autostart``) [``AUTOSTART_INSTALL_DIR``]
-``LOGGINGCATEGORIESDIR``
-    Qt logging categories files directory (``DATAROOTDIR/qlogging-categories5``) Since 5.59.0
-``JARDIR``
-    Java AAR/JAR files for Android. Since 5.62.0
-``SYSTEMDUNITDIR``
-    Systemd Units (``lib/systemd``)
-    [``SYSTEMD_UNIT_INSTALL_DIR``]. Since 5.65
-``SYSTEMDUSERUNITDIR``
-    Systemd User Units (``lib/systemd/user``)
-    [``SYSTEMD_USER_UNIT_INSTALL_DIR``]. Since 5.65
-
-If ``KDE_INSTALL_USE_QT_SYS_PATHS`` is set to TRUE before including this
-module, the default values for some variables are instead queried from
-Qt5's qmake (where mentioned in the parentheses above).
-If not set, it will default to TRUE if Qt5's qmake is found and
-it's ``QT_INSTALL_PREFIX`` is the same as ``CMAKE_INSTALL_PREFIX``,
-otherwise default to FALSE.
-This variable should NOT be set from within CMakeLists.txt files, instead
-is intended to be set manually when configuring a project which uses
-KDEInstallDirs (e.g. by packagers).
-
-If ``KDE_INSTALL_DIRS_NO_DEPRECATED`` is set to TRUE before including this
-module, the deprecated variables (listed in the square brackets above) are
-not defined.
-
-In addition, for each ``KDE_INSTALL_*`` variable, an equivalent
-``CMAKE_INSTALL_*`` variable is defined. If
-``KDE_INSTALL_DIRS_NO_DEPRECATED`` is set to TRUE, only those variables
-defined by the ``GNUInstallDirs`` module (shipped with CMake) are defined.
-If ``KDE_INSTALL_DIRS_NO_CMAKE_VARIABLES`` is set to TRUE, no variables with
-a ``CMAKE_`` prefix will be defined by this module (other than
-CMAKE_INSTALL_DEFAULT_COMPONENT_NAME - see below).
-
-The ``KDE_INSTALL_<dir>`` variables (or their ``CMAKE_INSTALL_<dir>`` or
-deprecated counterparts) may be passed to the DESTINATION options of
-``install()`` commands for the corresponding file type.  They are set in the
-CMake cache, and so the defaults above can be overridden by users.
-
-Note that the ``KDE_INSTALL_<dir>``, ``CMAKE_INSTALL_<dir>`` or deprecated
-form of the variable can be changed using CMake command line variable
-definitions; in either case, all forms of the variable will be affected. The
-effect of passing multiple forms of the same variable on the command line
-(such as ``KDE_INSTALL_BINDIR`` and ``CMAKE_INSTALL_BINDIR`` is undefined.
-
-The variable ``KDE_INSTALL_TARGETS_DEFAULT_ARGS`` is also defined (along with
-the deprecated form ``INSTALL_TARGETS_DEFAULT_ARGS``).  This should be used
-when libraries or user-executable applications are installed, in the
-following manner:
-
-.. code-block:: cmake
-
-  install(TARGETS mylib myapp ${KDE_INSTALL_TARGETS_DEFAULT_ARGS})
-
-It MUST NOT be used for installing plugins, system admin executables or
-executables only intended for use internally by other code.  Those should use
-``KDE_INSTALL_PLUGINDIR``, ``KDE_INSTALL_SBINDIR`` or
-``KDE_INSTALL_LIBEXECDIR`` respectively.
-
-Additionally, ``CMAKE_INSTALL_DEFAULT_COMPONENT_NAME`` will be set to
-``${PROJECT_NAME}`` to provide a sensible default for this CMake option.
-
-Note that mixing absolute and relative paths, particularly for ``BINDIR``,
-``LIBDIR`` and ``INCLUDEDIR``, can cause issues with exported targets. Given
-that the default values for these are relative paths, relative paths should
-be used on the command line when possible (eg: use
-``-DKDE_INSTALL_LIBDIR=lib64`` instead of
-``-DKDE_INSTALL_LIBDIR=/usr/lib/lib64`` to override the library directory).
-
-Since pre-1.0.0.
-
-NB: The variables starting ``KDE_INSTALL_`` are available since 1.6.0,
-unless otherwise noted with the variable.
-
-The ``KDE_INSTALL_PREFIX_SCRIPT`` option will install a ${CMAKE_INSTALL_PREFIX}/prefix.sh
-file that allows to easily incorporate the necessary environment variables
-for the prefix into a process.
+Since 5.82.0, prior to that equivalent to KDEInstallDirs5.
 #]=======================================================================]
 
-# Figure out what the default install directory for libraries should be.
-# This is based on the logic in GNUInstallDirs, but simplified (the
-# GNUInstallDirs code deals with re-configuring, but that is dealt with
-# by the _define_* macros in this module).
-set(_LIBDIR_DEFAULT "lib")
-# Override this default 'lib' with 'lib64' if:
-#  - we are on a Linux, kFreeBSD or Hurd system but NOT cross-compiling
-#  - we are NOT on debian
-#  - we are NOT on flatpak
-#  - we are on a 64 bits system
-# reason is: amd64 ABI: http://www.x86-64.org/documentation/abi.pdf
-# For Debian with multiarch, use 'lib/${CMAKE_LIBRARY_ARCHITECTURE}' if
-# CMAKE_LIBRARY_ARCHITECTURE is set (which contains e.g. "i386-linux-gnu"
-# See https://wiki.debian.org/Multiarch
-if((CMAKE_SYSTEM_NAME MATCHES "Linux|kFreeBSD" OR CMAKE_SYSTEM_NAME STREQUAL "GNU")
-   AND NOT CMAKE_CROSSCOMPILING
-   AND NOT EXISTS "/etc/arch-release"
-   AND NOT DEFINED ENV{FLATPAK_ID})
-  if (EXISTS "/etc/debian_version") # is this a debian system ?
-    if(CMAKE_LIBRARY_ARCHITECTURE)
-      set(_LIBDIR_DEFAULT "lib/${CMAKE_LIBRARY_ARCHITECTURE}")
-    endif()
-  else() # not debian, rely on CMAKE_SIZEOF_VOID_P:
-    if(NOT DEFINED CMAKE_SIZEOF_VOID_P)
-      message(AUTHOR_WARNING
-        "Unable to determine default LIB_INSTALL_LIBDIR directory because no target architecture is known. "
-        "Please enable at least one language before including KDEInstallDirs.")
-    else()
-      if("${CMAKE_SIZEOF_VOID_P}" EQUAL "8")
-        set(_LIBDIR_DEFAULT "lib64")
-      endif()
-    endif()
-  endif()
-endif()
-
-set(_gnu_install_dirs_vars
-    BINDIR
-    SBINDIR
-    LIBEXECDIR
-    SYSCONFDIR
-    SHAREDSTATEDIR
-    LOCALSTATEDIR
-    LIBDIR
-    INCLUDEDIR
-    OLDINCLUDEDIR
-    DATAROOTDIR
-    DATADIR
-    INFODIR
-    LOCALEDIR
-    MANDIR
-    DOCDIR)
-
-# Macro for variables that are relative to another variable. We store an empty
-# value in the cache (for documentation/GUI cache editor purposes), and store
-# the default value in a local variable. If the cache variable is ever set to
-# something non-empty, the local variable will no longer be set. However, if
-# the cache variable remains (or is set to be) empty, the value will be
-# relative to that of the parent variable.
-#
-# varname:   the variable name suffix (eg: BINDIR for KDE_INSTALL_BINDIR)
-# parent:    the variable suffix of the variable this is relative to
-#            (eg: DATAROOTDIR for KDE_INSTALL_DATAROOTDIR)
-# subdir:    the path of the default value of KDE_INSTALL_${varname}
-#            relative to KDE_INSTALL_${parent}: no leading /
-# docstring: documentation about the variable (not including the default value)
-# oldstylename (optional): the old-style name of the variable
-macro(_define_relative varname parent subdir docstring)
-    set(_oldstylename)
-    if(NOT KDE_INSTALL_DIRS_NO_DEPRECATED AND ${ARGC} GREATER 4)
-        set(_oldstylename "${ARGV4}")
-    endif()
-    set(_cmakename)
-    if(NOT KDE_INSTALL_DIRS_NO_CMAKE_VARIABLES)
-        list(FIND _gnu_install_dirs_vars "${varname}" _list_offset)
-        set(_cmakename_is_deprecated FALSE)
-        if(NOT KDE_INSTALL_DIRS_NO_DEPRECATED OR NOT _list_offset EQUAL -1)
-            set(_cmakename CMAKE_INSTALL_${varname})
-            if(_list_offset EQUAL -1)
-                set(_cmakename_is_deprecated TRUE)
-            endif()
-        endif()
-    endif()
-
-    # Surprisingly complex logic to deal with joining paths.
-    # Note that we cannot use arg vars directly in if() because macro args are
-    # not proper variables.
-    set(_parent "${parent}")
-    set(_subdir "${subdir}")
-    if(_parent AND _subdir)
-        set(_docpath "${_parent}/${_subdir}")
-        if(KDE_INSTALL_${_parent})
-            set(_realpath "${KDE_INSTALL_${_parent}}/${_subdir}")
-        else()
-            set(_realpath "${_subdir}")
-        endif()
-    elseif(_parent)
-        set(_docpath "${_parent}")
-        set(_realpath "${KDE_INSTALL_${_parent}}")
-    else()
-        set(_docpath "${_subdir}")
-        set(_realpath "${_subdir}")
-    endif()
-
-    if(KDE_INSTALL_${varname})
-        # make sure the cache documentation is set correctly
-        get_property(_iscached CACHE KDE_INSTALL_${varname} PROPERTY VALUE SET)
-        if (_iscached)
-            # make sure the docs are still set if it was passed on the command line
-            set_property(CACHE KDE_INSTALL_${varname}
-                PROPERTY HELPSTRING "${docstring} (${_docpath})")
-            # make sure the type is correct if it was passed on the command line
-            set_property(CACHE KDE_INSTALL_${varname}
-                PROPERTY TYPE PATH)
-        endif()
-    elseif(${_oldstylename})
-        message(DEPRECATION "${_oldstylename} is deprecated, use KDE_INSTALL_${varname} instead.")
-        # The old name was given (probably on the command line): move
-        # it to the new name
-        set(KDE_INSTALL_${varname} "${${_oldstylename}}"
-            CACHE PATH
-                  "${docstring} (${_docpath})"
-                  FORCE)
-    elseif(${_cmakename})
-        if(_cmakename_is_deprecated)
-            message(DEPRECATION "${_cmakename} is deprecated, use KDE_INSTALL_${varname} instead.")
-        endif()
-        # The CMAKE_ name was given (probably on the command line): move
-        # it to the new name
-        set(KDE_INSTALL_${varname} "${${_cmakename}}"
-            CACHE PATH
-                  "${docstring} (${_docpath})"
-                  FORCE)
-    else()
-        # insert an empty value into the cache, indicating the default
-        # should be used (including compatibility vars above)
-        set(KDE_INSTALL_${varname} ""
-            CACHE PATH "${docstring} (${_docpath})")
-        set(KDE_INSTALL_${varname} "${_realpath}")
-    endif()
-
-    mark_as_advanced(KDE_INSTALL_${varname})
-
-    if(NOT IS_ABSOLUTE ${KDE_INSTALL_${varname}})
-        set(KDE_INSTALL_FULL_${varname}
-            "${CMAKE_INSTALL_PREFIX}/${KDE_INSTALL_${varname}}")
-    else()
-        set(KDE_INSTALL_FULL_${varname} "${KDE_INSTALL_${varname}}")
-    endif()
-
-    # Override compatibility vars at runtime, even though we don't touch
-    # them in the cache; this way, we keep the variables in sync where
-    # KDEInstallDirs is included, but don't interfere with, say,
-    # GNUInstallDirs in a parallel part of the CMake tree.
-    if(_cmakename)
-        set(${_cmakename} "${KDE_INSTALL_${varname}}")
-        set(CMAKE_INSTALL_FULL_${varname} "${KDE_INSTALL_FULL_${varname}}")
-    endif()
-
-    if(_oldstylename)
-        set(${_oldstylename} "${KDE_INSTALL_${varname}}")
-    endif()
-endmacro()
-
-# varname:   the variable name suffix (eg: BINDIR for KDE_INSTALL_BINDIR)
-# dir:       the relative path of the default value of KDE_INSTALL_${varname}
-#            relative to CMAKE_INSTALL_PREFIX: no leading /
-# docstring: documentation about the variable (not including the default value)
-# oldstylename (optional): the old-style name of the variable
-macro(_define_absolute varname dir docstring)
-    _define_relative("${varname}" "" "${dir}" "${docstring}" ${ARGN})
-endmacro()
-
-macro(_define_non_cache varname value)
-    set(KDE_INSTALL_${varname} "${value}")
-    if(NOT IS_ABSOLUTE ${KDE_INSTALL_${varname}})
-        set(KDE_INSTALL_FULL_${varname}
-            "${CMAKE_INSTALL_PREFIX}/${KDE_INSTALL_${varname}}")
-    else()
-        set(KDE_INSTALL_FULL_${varname} "${KDE_INSTALL_${varname}}")
-    endif()
-
-    if(NOT KDE_INSTALL_DIRS_NO_CMAKE_VARIABLES)
-        list(FIND _gnu_install_dirs_vars "${varname}" _list_offset)
-        if(NOT KDE_INSTALL_DIRS_NO_DEPRECATED OR NOT _list_offset EQUAL -1)
-            set(CMAKE_INSTALL_${varname} "${KDE_INSTALL_${varname}}")
-            set(CMAKE_INSTALL_FULL_${varname} "${KDE_INSTALL_FULL_${varname}}")
-        endif()
-    endif()
-endmacro()
-
-if(APPLE)
-    _define_absolute(BUNDLEDIR "/Applications/KDE"
-        "application bundles"
-        BUNDLE_INSTALL_DIR)
-endif()
-
-if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
-    set(CMAKE_INSTALL_PREFIX "${ECM_PREFIX}" CACHE PATH "Install path prefix" FORCE)
-endif()
-
-_define_absolute(EXECROOTDIR ""
-    "executables and libraries"
-    EXEC_INSTALL_PREFIX)
-
-_define_relative(BINDIR EXECROOTDIR "bin"
-    "user executables"
-    BIN_INSTALL_DIR)
-_define_relative(SBINDIR EXECROOTDIR "sbin"
-    "system admin executables"
-    SBIN_INSTALL_DIR)
-_define_relative(LIBDIR EXECROOTDIR "${_LIBDIR_DEFAULT}"
-    "object code libraries"
-    LIB_INSTALL_DIR)
-
-if(WIN32)
-    _define_relative(LIBEXECDIR BINDIR ""
-        "executables for internal use by programs and libraries"
-        LIBEXEC_INSTALL_DIR)
-    _define_non_cache(LIBEXECDIR_KF5 "${CMAKE_INSTALL_LIBEXECDIR}")
-else()
-    _define_relative(LIBEXECDIR LIBDIR "libexec"
-        "executables for internal use by programs and libraries"
-        LIBEXEC_INSTALL_DIR)
-    _define_non_cache(LIBEXECDIR_KF5 "${CMAKE_INSTALL_LIBEXECDIR}/kf5")
-endif()
-if(NOT KDE_INSTALL_DIRS_NO_DEPRECATED)
-    set(KF5_LIBEXEC_INSTALL_DIR "${CMAKE_INSTALL_LIBEXECDIR_KF5}")
-endif()
-_define_relative(CMAKEPACKAGEDIR LIBDIR "cmake"
-    "CMake packages, including config files"
-    CMAKECONFIG_INSTALL_PREFIX)
-
-include("${ECM_MODULE_DIR}/ECMQueryQmake.cmake")
-
-set(_default_KDE_INSTALL_USE_QT_SYS_PATHS OFF)
-if(NOT DEFINED KDE_INSTALL_USE_QT_SYS_PATHS)
-    query_qmake(qt_install_prefix_dir QT_INSTALL_PREFIX TRY)
-    if(qt_install_prefix_dir STREQUAL "${CMAKE_INSTALL_PREFIX}")
-        message(STATUS "Installing in the same prefix as Qt, adopting their path scheme.")
-        set(_default_KDE_INSTALL_USE_QT_SYS_PATHS ON)
-    endif()
-endif()
-
-option (KDE_INSTALL_USE_QT_SYS_PATHS "Install mkspecs files, QCH files for Qt-based libs, Plugins and Imports to the Qt 5 install dir" "${_default_KDE_INSTALL_USE_QT_SYS_PATHS}")
-if(KDE_INSTALL_USE_QT_SYS_PATHS)
-    # Qt-specific vars
-    query_qmake(qt_install_prefix_dir QT_INSTALL_PREFIX TRY)
-    query_qmake(qt_plugins_dir QT_INSTALL_PLUGINS)
-
-    if(qt_install_prefix_dir STREQUAL "${CMAKE_INSTALL_PREFIX}")
-        file(RELATIVE_PATH qt_plugins_dir ${qt_install_prefix_dir} ${qt_plugins_dir})
-    endif()
-    _define_absolute(QTPLUGINDIR ${qt_plugins_dir}
-        "Qt plugins"
-         QT_PLUGIN_INSTALL_DIR)
-
-    query_qmake(qt_imports_dir QT_INSTALL_IMPORTS)
-
-    if(qt_install_prefix_dir STREQUAL "${CMAKE_INSTALL_PREFIX}")
-        file(RELATIVE_PATH qt_imports_dir ${qt_install_prefix_dir} ${qt_imports_dir})
-    endif()
-    _define_absolute(QTQUICKIMPORTSDIR ${qt_imports_dir}
-        "QtQuick1 imports"
-        IMPORTS_INSTALL_DIR)
-
-    query_qmake(qt_qml_dir QT_INSTALL_QML)
-
-    if(qt_install_prefix_dir STREQUAL "${CMAKE_INSTALL_PREFIX}")
-        file(RELATIVE_PATH qt_qml_dir ${qt_install_prefix_dir} ${qt_qml_dir})
-    endif()
-    _define_absolute(QMLDIR ${qt_qml_dir}
-        "QtQuick2 imports"
-        QML_INSTALL_DIR)
-else()
-    set(_pluginsDirParent LIBDIR)
-    if (ANDROID)
-        set(_pluginsDirParent)
-        #androiddeployqt wants plugins right in the prefix
-    endif()
-    _define_relative(QTPLUGINDIR "${_pluginsDirParent}" "plugins"
-        "Qt plugins"
-        QT_PLUGIN_INSTALL_DIR)
-
-    _define_relative(QTQUICKIMPORTSDIR QTPLUGINDIR "imports"
-        "QtQuick1 imports"
-        IMPORTS_INSTALL_DIR)
-
-    _define_relative(QMLDIR LIBDIR "qml"
-        "QtQuick2 imports"
-        QML_INSTALL_DIR)
-endif()
-
-_define_relative(PLUGINDIR QTPLUGINDIR ""
-    "Plugins"
-    PLUGIN_INSTALL_DIR)
-
-_define_absolute(INCLUDEDIR "include"
-    "C and C++ header files"
-    INCLUDE_INSTALL_DIR)
-_define_non_cache(INCLUDEDIR_KF5 "${CMAKE_INSTALL_INCLUDEDIR}/KF5")
-if(NOT KDE_INSTALL_DIRS_NO_DEPRECATED)
-    set(KF5_INCLUDE_INSTALL_DIR "${CMAKE_INSTALL_INCLUDEDIR_KF5}")
-endif()
-
-_define_absolute(LOCALSTATEDIR "var"
-    "modifiable single-machine data")
-
-_define_absolute(SHAREDSTATEDIR "com"
-    "modifiable architecture-independent data")
-
-
-
-if (WIN32)
-    _define_relative(DATAROOTDIR BINDIR "data"
-        "read-only architecture-independent data root"
-        SHARE_INSTALL_PREFIX)
-else()
-    _define_absolute(DATAROOTDIR "share"
-        "read-only architecture-independent data root"
-        SHARE_INSTALL_PREFIX)
-endif()
-
-_define_relative(DATADIR DATAROOTDIR ""
-    "read-only architecture-independent data"
-    DATA_INSTALL_DIR)
-_define_non_cache(DATADIR_KF5 "${CMAKE_INSTALL_DATADIR}/kf5")
-if(NOT KDE_INSTALL_DIRS_NO_DEPRECATED)
-    set(KF5_DATA_INSTALL_DIR "${CMAKE_INSTALL_DATADIR_KF5}")
-endif()
-
-# Qt-specific data vars
-if(KDE_INSTALL_USE_QT_SYS_PATHS)
-    query_qmake(qt_docs_dir QT_INSTALL_DOCS)
-
-    _define_absolute(QTQCHDIR ${qt_docs_dir}
-        "documentation bundles in QCH format for Qt-extending libraries")
-else()
-    _define_relative(QTQCHDIR DATAROOTDIR "doc/qch"
-        "documentation bundles in QCH format for Qt-extending libraries")
-endif()
-
-
-# KDE Framework-specific things
-_define_relative(DOCBUNDLEDIR DATAROOTDIR "doc/HTML"
-    "documentation bundles generated using kdoctools"
-    HTML_INSTALL_DIR)
-_define_relative(KCFGDIR DATAROOTDIR "config.kcfg"
-    "kconfig description files"
-    KCFG_INSTALL_DIR)
-_define_relative(KCONFUPDATEDIR DATAROOTDIR "kconf_update"
-    "kconf_update scripts"
-    KCONF_UPDATE_INSTALL_DIR)
-_define_relative(KSERVICES5DIR DATAROOTDIR "kservices5"
-    "services for KDE Frameworks 5"
-    SERVICES_INSTALL_DIR)
-_define_relative(KSERVICETYPES5DIR DATAROOTDIR "kservicetypes5"
-    "service types for KDE Frameworks 5"
-    SERVICETYPES_INSTALL_DIR)
-_define_relative(KNOTIFY5RCDIR DATAROOTDIR "knotifications5"
-    "knotify description files"
-    KNOTIFYRC_INSTALL_DIR)
-_define_relative(KXMLGUI5DIR DATAROOTDIR "kxmlgui5"
-    "kxmlgui .rc files"
-    KXMLGUI_INSTALL_DIR)
-_define_relative(KAPPTEMPLATESDIR DATAROOTDIR "kdevappwizard/templates"
-    "KAppTemplate and KDevelop templates"
-    KDE_INSTALL_KTEMPLATESDIR
-    )
-_define_relative(KFILETEMPLATESDIR DATAROOTDIR "kdevfiletemplates/templates"
-    "KDevelop file templates")
-_define_relative(LOGGINGCATEGORIESDIR DATAROOTDIR "qlogging-categories5"
-    "Qt Logging categories files")
-_define_relative(JARDIR "" "jar"
-    "Java AAR/JAR files for Android")
-
-# Cross-desktop or other system things
-_define_relative(ICONDIR DATAROOTDIR "icons"
-    "icons"
-    ICON_INSTALL_DIR)
-_define_relative(LOCALEDIR DATAROOTDIR "locale"
-    "knotify description files"
-    LOCALE_INSTALL_DIR)
-_define_relative(SOUNDDIR DATAROOTDIR "sounds"
-    "sound files"
-    SOUND_INSTALL_DIR)
-_define_relative(TEMPLATEDIR DATAROOTDIR "templates"
-    "templates"
-    TEMPLATES_INSTALL_DIR)
-_define_relative(WALLPAPERDIR DATAROOTDIR "wallpapers"
-    "desktop wallpaper images"
-    WALLPAPER_INSTALL_DIR)
-_define_relative(APPDIR DATAROOTDIR "applications"
-    "application desktop files"
-    XDG_APPS_INSTALL_DIR)
-_define_relative(DESKTOPDIR DATAROOTDIR "desktop-directories"
-    "desktop directories"
-    XDG_DIRECTORY_INSTALL_DIR)
-_define_relative(MIMEDIR DATAROOTDIR "mime/packages"
-    "mime description files"
-    XDG_MIME_INSTALL_DIR)
-_define_relative(METAINFODIR DATAROOTDIR "metainfo"
-    "AppStream component metadata")
-_define_relative(QCHDIR DATAROOTDIR "doc/qch"
-    "documentation bundles in QCH format")
-_define_relative(MANDIR DATAROOTDIR "man"
-    "man documentation"
-    MAN_INSTALL_DIR)
-_define_relative(INFODIR DATAROOTDIR "info"
-    "info documentation")
-_define_relative(DBUSDIR DATAROOTDIR "dbus-1"
-    "D-Bus")
-_define_relative(DBUSINTERFACEDIR DBUSDIR "interfaces"
-    "D-Bus interfaces"
-    DBUS_INTERFACES_INSTALL_DIR)
-_define_relative(DBUSSERVICEDIR DBUSDIR "services"
-    "D-Bus session services"
-    DBUS_SERVICES_INSTALL_DIR)
-_define_relative(DBUSSYSTEMSERVICEDIR DBUSDIR "system-services"
-    "D-Bus system services"
-    DBUS_SYSTEM_SERVICES_INSTALL_DIR)
-_define_relative(SYSTEMDUNITDIR CMAKE_INSTALL_PREFIX "lib/systemd"
-    "Systemd units"
-    SYSTEMD_UNIT_INSTALL_DIR)
-_define_relative(SYSTEMDUSERUNITDIR SYSTEMDUNITDIR "user"
-    "Systemd user units"
-    SYSTEMD_USER_UNIT_INSTALL_DIR)
-
-
-set(_default_sysconf_dir "etc")
-if (CMAKE_INSTALL_PREFIX STREQUAL "/usr")
-    set(_default_sysconf_dir "/etc")
-endif()
-
-
-_define_absolute(SYSCONFDIR "${_default_sysconf_dir}"
-    "read-only single-machine data"
-    SYSCONF_INSTALL_DIR)
-_define_relative(CONFDIR SYSCONFDIR "xdg"
-    "application configuration files"
-    CONFIG_INSTALL_DIR)
-_define_relative(AUTOSTARTDIR CONFDIR "autostart"
-    "autostart files"
-    AUTOSTART_INSTALL_DIR)
-
-set(_mixed_core_path_styles FALSE)
-if (IS_ABSOLUTE "${KDE_INSTALL_BINDIR}")
-    if (NOT IS_ABSOLUTE "${KDE_INSTALL_LIBDIR}" OR NOT IS_ABSOLUTE "${KDE_INSTALL_INCLUDEDIR}")
-        set(_mixed_core_path_styles )
-    endif()
-else()
-    if (IS_ABSOLUTE "${KDE_INSTALL_LIBDIR}" OR IS_ABSOLUTE "${KDE_INSTALL_INCLUDEDIR}")
-        set(_mixed_core_path_styles TRUE)
-    endif()
-endif()
-if (_mixed_core_path_styles)
-    message(WARNING "KDE_INSTALL_BINDIR, KDE_INSTALL_LIBDIR and KDE_INSTALL_INCLUDEDIR should either all be absolute paths or all be relative paths.")
-endif()
-
-
-# For more documentation see above.
-# Later on it will be possible to extend this for installing OSX frameworks
-# The COMPONENT Devel argument has the effect that static libraries belong to the
-# "Devel" install component. If we use this also for all install() commands
-# for header files, it will be possible to install
-#   -everything: make install OR cmake -P cmake_install.cmake
-#   -only the development files: cmake -DCOMPONENT=Devel -P cmake_install.cmake
-#   -everything except the development files: cmake -DCOMPONENT=Unspecified -P cmake_install.cmake
-# This can then also be used for packaging with cpack.
-# FIXME: why is INCLUDES (only) set for ARCHIVE targets?
-set(KDE_INSTALL_TARGETS_DEFAULT_ARGS  RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
-                                      LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
-                                      ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}" COMPONENT Devel
-                                      INCLUDES DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}"
-)
-set(KF5_INSTALL_TARGETS_DEFAULT_ARGS  RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
-                                      LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
-                                      ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}" COMPONENT Devel
-                                      INCLUDES DESTINATION "${CMAKE_INSTALL_INCLUDEDIR_KF5}"
-)
-
-# on the Mac support an extra install directory for application bundles
-if(APPLE)
-    set(KDE_INSTALL_TARGETS_DEFAULT_ARGS  ${KDE_INSTALL_TARGETS_DEFAULT_ARGS}
-                                          BUNDLE DESTINATION "${BUNDLE_INSTALL_DIR}" )
-    set(KF5_INSTALL_TARGETS_DEFAULT_ARGS  ${KF5_INSTALL_TARGETS_DEFAULT_ARGS}
-                                          BUNDLE DESTINATION "${BUNDLE_INSTALL_DIR}" )
-endif()
-
-if(NOT KDE_INSTALL_DIRS_NO_DEPRECATED)
-    set(INSTALL_TARGETS_DEFAULT_ARGS ${KDE_INSTALL_TARGETS_DEFAULT_ARGS})
-endif()
-
-# new in cmake 2.8.9: this is used for all installed files which do not have a component set
-# so set the default component name to the name of the project, if a project name has been set:
-if(NOT "${PROJECT_NAME}" STREQUAL "Project")
-    set(CMAKE_INSTALL_DEFAULT_COMPONENT_NAME "${PROJECT_NAME}")
-endif()
-
-
-###################################################################
-# Prefix set up
-
-configure_file(${CMAKE_CURRENT_LIST_DIR}/prefix.sh.cmake ${CMAKE_CURRENT_BINARY_DIR}/prefix.sh @ONLY)
-find_program(FISH_EXECUTABLE fish)
-if(FISH_EXECUTABLE)
-    configure_file(${CMAKE_CURRENT_LIST_DIR}/prefix.sh.fish.cmake ${CMAKE_CURRENT_BINARY_DIR}/prefix.sh.fish @ONLY)
-endif()
-
-option(KDE_INSTALL_PREFIX_SCRIPT "Installs ${CMAKE_INSTALL_PREFIX}/prefix.sh that sets up the necessary environment variables" OFF)
-if(KDE_INSTALL_PREFIX_SCRIPT)
-    install(FILES ${CMAKE_CURRENT_BINARY_DIR}/prefix.sh DESTINATION ${CMAKE_INSTALL_PREFIX} PERMISSIONS OWNER_EXECUTE OWNER_WRITE OWNER_READ)
-endif()
-
-if(NOT KDE_INSTALL_USE_QT_SYS_PATHS)
-    message("Installing in ${CMAKE_INSTALL_PREFIX}. Run ${CMAKE_CURRENT_BINARY_DIR}/prefix.sh to set the environment for ${CMAKE_PROJECT_NAME}.")
-endif()
+include(${CMAKE_CURRENT_LIST_DIR}/../modules/QtVersionOption.cmake)
+include(${CMAKE_CURRENT_LIST_DIR}/KDEInstallDirs${QT_MAJOR_VERSION}.cmake)
diff --git a/kde-modules/KDEInstallDirs5.cmake b/kde-modules/KDEInstallDirs5.cmake
new file mode 100644
index 00000000..21039420
--- /dev/null
+++ b/kde-modules/KDEInstallDirs5.cmake
@@ -0,0 +1,356 @@
+# SPDX-FileCopyrightText: 2014-2015 Alex Merry <alex.merry@kde.org>
+# SPDX-FileCopyrightText: 2013 Stephen Kelly <steveire@gmail.com>
+# SPDX-FileCopyrightText: 2012 David Faure <faure@kde.org>
+# SPDX-FileCopyrightText: 2007 Matthias Kretz <kretz@kde.org>
+# SPDX-FileCopyrightText: 2006-2007 Laurent Montel <montel@kde.org>
+# SPDX-FileCopyrightText: 2006-2013 Alex Neundorf <neundorf@kde.org>
+#
+# SPDX-License-Identifier: BSD-3-Clause
+
+#[=======================================================================[.rst:
+KDEInstallDirs5
+---------------
+
+Define KDE standard installation directories for Qt5/KF5 based software.
+
+Note that none of the variables defined by this module provide any
+information about the location of already-installed KDE software.
+
+Also sets ``CMAKE_INSTALL_PREFIX`` to the installation prefix of ECM,
+unless that variable has been already explicitly set by something else
+(since 5.61 and with CMake >= 3.7).
+
+Inclusion of this module defines the following variables:
+
+``KDE_INSTALL_<dir>``
+    destination for files of a given type
+``KDE_INSTALL_FULL_<dir>``
+    corresponding absolute path
+
+where ``<dir>`` is one of (default values in parentheses and alternative,
+deprecated variable name in square brackets):
+
+``BUNDLEDIR``
+    application bundles (``/Applications/KDE``) [``BUNDLE_INSTALL_DIR``]
+``EXECROOTDIR``
+    executables and libraries (``<empty>``) [``EXEC_INSTALL_PREFIX``]
+``BINDIR``
+    user executables (``EXECROOTDIR/bin``) [``BIN_INSTALL_DIR``]
+``SBINDIR``
+    system admin executables (``EXECROOTDIR/sbin``) [``SBIN_INSTALL_DIR``]
+``LIBDIR``
+    object code libraries (``EXECROOTDIR/lib``, ``EXECROOTDIR/lib64`` or
+    ``EXECROOTDIR/lib/<multiarch-tuple`` on Debian) [``LIB_INSTALL_DIR``]
+``LIBEXECDIR``
+    executables for internal use by programs and libraries (``BINDIR`` on
+    Windows, ``LIBDIR/libexec`` otherwise) [``LIBEXEC_INSTALL_DIR``]
+``CMAKEPACKAGEDIR``
+    CMake packages, including config files (``LIBDIR/cmake``)
+    [``CMAKECONFIG_INSTALL_PREFIX``]
+``QTPLUGINDIR``
+    Qt plugins (``LIBDIR/plugins`` or qmake-qt5's ``QT_INSTALL_PLUGINS``) [``QT_PLUGIN_INSTALL_DIR``]
+``PLUGINDIR``
+    Plugins (``QTPLUGINDIR``) [``PLUGIN_INSTALL_DIR``]
+``QTQUICKIMPORTSDIR``
+    QtQuick1 imports (``QTPLUGINDIR/imports`` or qmake-qt5's ``QT_INSTALL_IMPORTS``) [``IMPORTS_INSTALL_DIR``]
+``QMLDIR``
+    QtQuick2 imports (``LIBDIR/qml`` or qmake-qt5's ``QT_INSTALL_QML``) [``QML_INSTALL_DIR``]
+``INCLUDEDIR``
+    C and C++ header files (``include``) [``INCLUDE_INSTALL_DIR``]
+``LOCALSTATEDIR``
+    modifiable single-machine data (``var``)
+``SHAREDSTATEDIR``
+    modifiable architecture-independent data (``com``)
+``DATAROOTDIR``
+    read-only architecture-independent data root (``share``)
+    [``SHARE_INSTALL_PREFIX``]
+``DATADIR``
+    read-only architecture-independent data (``DATAROOTDIR``)
+    [``DATA_INSTALL_DIR``]
+``DOCBUNDLEDIR``
+    documentation bundles generated using kdoctools
+    (``DATAROOTDIR/doc/HTML``) [``HTML_INSTALL_DIR``]
+``KCFGDIR``
+    kconfig description files (``DATAROOTDIR/config.kcfg``)
+    [``KCFG_INSTALL_DIR``]
+``KCONFUPDATEDIR``
+    kconf_update scripts (``DATAROOTDIR/kconf_update``)
+    [``KCONF_UPDATE_INSTALL_DIR``]
+``KSERVICES5DIR``
+    services for KDE Frameworks 5 (``DATAROOTDIR/kservices5``)
+    [``SERVICES_INSTALL_DIR``]
+``KSERVICETYPES5DIR``
+    service types for KDE Frameworks 5 (``DATAROOTDIR/kservicetypes5``)
+    [``SERVICETYPES_INSTALL_DIR``]
+``KXMLGUI5DIR``
+    knotify description files (``DATAROOTDIR/kxmlgui5``)
+    [``KXMLGUI_INSTALL_DIR``]
+``KTEMPLATESDIR``
+    Kapptemplate and Kdevelop templates (``kdevappwizard/templates``)
+``KNOTIFY5RCDIR``
+    knotify description files (``DATAROOTDIR/knotifications5``)
+    [``KNOTIFYRC_INSTALL_DIR``]
+``ICONDIR``
+    icons (``DATAROOTDIR/icons``) [``ICON_INSTALL_DIR``]
+``LOCALEDIR``
+    knotify description files (``DATAROOTDIR/locale``)
+    [``LOCALE_INSTALL_DIR``]
+``SOUNDDIR``
+    sound files (``DATAROOTDIR/sounds``) [``SOUND_INSTALL_DIR``]
+``TEMPLATEDIR``
+    templates (``DATAROOTDIR/templates``) [``TEMPLATES_INSTALL_DIR``]
+``WALLPAPERDIR``
+    desktop wallpaper images (``DATAROOTDIR/wallpapers``)
+    [``WALLPAPER_INSTALL_DIR``]
+``APPDIR``
+    application desktop files (``DATAROOTDIR/applications``) Since 1.1.0.
+    [``XDG_APPS_INSTALL_DIR``]
+``DESKTOPDIR``
+    desktop directories (``DATAROOTDIR/desktop-directories``)
+    [``XDG_DIRECTORY_INSTALL_DIR``]
+``MIMEDIR``
+    mime description files (``DATAROOTDIR/mime/packages``)
+    [``XDG_MIME_INSTALL_DIR``]
+``METAINFODIR``
+    AppStream component metadata files (``DATAROOTDIR/metainfo``)
+``QTQCHDIR``
+    documentation bundles in QCH format for Qt-extending libraries (``DATAROOTDIR/doc/qch`` or qmake-qt5's ``QT_INSTALL_DOCS``) Since 5.36.0.
+``QCHDIR``
+    documentation bundles in QCH format (``DATAROOTDIR/doc/qch``) Since 5.36.0.
+``MANDIR``
+    man documentation (``DATAROOTDIR/man``) [``MAN_INSTALL_DIR``]
+``INFODIR``
+    info documentation (``DATAROOTDIR/info``)
+``DBUSDIR``
+    D-Bus (``DATAROOTDIR/dbus-1``)
+``DBUSINTERFACEDIR``
+    D-Bus interfaces (``DBUSDIR/interfaces``)
+    [``DBUS_INTERFACES_INSTALL_DIR``]
+``DBUSSERVICEDIR``
+    D-Bus session services (``DBUSDIR/services``)
+    [``DBUS_SERVICES_INSTALL_DIR``]
+``DBUSSYSTEMSERVICEDIR``
+    D-Bus system services (``DBUSDIR/system-services``)
+    [``DBUS_SYSTEM_SERVICES_INSTALL_DIR``]
+``SYSCONFDIR``
+    read-only single-machine data
+    (``etc``, or ``/etc`` if ``CMAKE_INSTALL_PREFIX`` is ``/usr``)
+    [``SYSCONF_INSTALL_DIR``]
+``CONFDIR``
+    application configuration files (``SYSCONFDIR/xdg``)
+    [``CONFIG_INSTALL_DIR``]
+``AUTOSTARTDIR``
+    autostart files (``CONFDIR/autostart``) [``AUTOSTART_INSTALL_DIR``]
+``LOGGINGCATEGORIESDIR``
+    Qt logging categories files directory (``DATAROOTDIR/qlogging-categories5``) Since 5.59.0
+``JARDIR``
+    Java AAR/JAR files for Android. Since 5.62.0
+``SYSTEMDUNITDIR``
+    Systemd Units (``lib/systemd``)
+    [``SYSTEMD_UNIT_INSTALL_DIR``]. Since 5.65
+``SYSTEMDUSERUNITDIR``
+    Systemd User Units (``lib/systemd/user``)
+    [``SYSTEMD_USER_UNIT_INSTALL_DIR``]. Since 5.65
+
+If ``KDE_INSTALL_USE_QT_SYS_PATHS`` is set to TRUE before including this
+module, the default values for some variables are instead queried from
+Qt5's qmake (where mentioned in the parentheses above).
+If not set, it will default to TRUE if Qt5's qmake is found and
+it's ``QT_INSTALL_PREFIX`` is the same as ``CMAKE_INSTALL_PREFIX``,
+otherwise default to FALSE.
+This variable should NOT be set from within CMakeLists.txt files, instead
+is intended to be set manually when configuring a project which uses
+KDEInstallDirs (e.g. by packagers).
+
+If ``KDE_INSTALL_DIRS_NO_DEPRECATED`` is set to TRUE before including this
+module, the deprecated variables (listed in the square brackets above) are
+not defined.
+
+In addition, for each ``KDE_INSTALL_*`` variable, an equivalent
+``CMAKE_INSTALL_*`` variable is defined. If
+``KDE_INSTALL_DIRS_NO_DEPRECATED`` is set to TRUE, only those variables
+defined by the ``GNUInstallDirs`` module (shipped with CMake) are defined.
+If ``KDE_INSTALL_DIRS_NO_CMAKE_VARIABLES`` is set to TRUE, no variables with
+a ``CMAKE_`` prefix will be defined by this module (other than
+CMAKE_INSTALL_DEFAULT_COMPONENT_NAME - see below).
+
+The ``KDE_INSTALL_<dir>`` variables (or their ``CMAKE_INSTALL_<dir>`` or
+deprecated counterparts) may be passed to the DESTINATION options of
+``install()`` commands for the corresponding file type.  They are set in the
+CMake cache, and so the defaults above can be overridden by users.
+
+Note that the ``KDE_INSTALL_<dir>``, ``CMAKE_INSTALL_<dir>`` or deprecated
+form of the variable can be changed using CMake command line variable
+definitions; in either case, all forms of the variable will be affected. The
+effect of passing multiple forms of the same variable on the command line
+(such as ``KDE_INSTALL_BINDIR`` and ``CMAKE_INSTALL_BINDIR`` is undefined.
+
+The variable ``KDE_INSTALL_TARGETS_DEFAULT_ARGS`` is also defined (along with
+the deprecated form ``INSTALL_TARGETS_DEFAULT_ARGS``).  This should be used
+when libraries or user-executable applications are installed, in the
+following manner:
+
+.. code-block:: cmake
+
+  install(TARGETS mylib myapp ${KDE_INSTALL_TARGETS_DEFAULT_ARGS})
+
+It MUST NOT be used for installing plugins, system admin executables or
+executables only intended for use internally by other code.  Those should use
+``KDE_INSTALL_PLUGINDIR``, ``KDE_INSTALL_SBINDIR`` or
+``KDE_INSTALL_LIBEXECDIR`` respectively.
+
+Additionally, ``CMAKE_INSTALL_DEFAULT_COMPONENT_NAME`` will be set to
+``${PROJECT_NAME}`` to provide a sensible default for this CMake option.
+
+Note that mixing absolute and relative paths, particularly for ``BINDIR``,
+``LIBDIR`` and ``INCLUDEDIR``, can cause issues with exported targets. Given
+that the default values for these are relative paths, relative paths should
+be used on the command line when possible (eg: use
+``-DKDE_INSTALL_LIBDIR=lib64`` instead of
+``-DKDE_INSTALL_LIBDIR=/usr/lib/lib64`` to override the library directory).
+
+Since 5.82.0, prior to that available as KDEInstallDirs.
+
+NB: The variables starting ``KDE_INSTALL_`` are available since 1.6.0,
+unless otherwise noted with the variable.
+
+The ``KDE_INSTALL_PREFIX_SCRIPT`` option will install a ${CMAKE_INSTALL_PREFIX}/prefix.sh
+file that allows to easily incorporate the necessary environment variables
+for the prefix into a process.
+
+#]=======================================================================]
+
+include(${CMAKE_CURRENT_LIST_DIR}/KDEInstallDirsCommon.cmake)
+
+if(WIN32)
+    _define_non_cache(LIBEXECDIR_KF5 "${CMAKE_INSTALL_LIBEXECDIR}")
+else()
+    _define_non_cache(LIBEXECDIR_KF5 "${CMAKE_INSTALL_LIBEXECDIR}/kf5")
+endif()
+if(NOT KDE_INSTALL_DIRS_NO_DEPRECATED)
+    set(KF5_LIBEXEC_INSTALL_DIR "${CMAKE_INSTALL_LIBEXECDIR_KF5}")
+endif()
+
+include("${ECM_MODULE_DIR}/ECMQueryQmake.cmake")
+
+set(_default_KDE_INSTALL_USE_QT_SYS_PATHS OFF)
+if(NOT DEFINED KDE_INSTALL_USE_QT_SYS_PATHS)
+    query_qmake(qt_install_prefix_dir QT_INSTALL_PREFIX TRY)
+    if(qt_install_prefix_dir STREQUAL "${CMAKE_INSTALL_PREFIX}")
+        message(STATUS "Installing in the same prefix as Qt, adopting their path scheme.")
+        set(_default_KDE_INSTALL_USE_QT_SYS_PATHS ON)
+    endif()
+endif()
+
+option (KDE_INSTALL_USE_QT_SYS_PATHS "Install mkspecs files, QCH files for Qt-based libs, Plugins and Imports to the Qt 5 install dir" "${_default_KDE_INSTALL_USE_QT_SYS_PATHS}")
+if(KDE_INSTALL_USE_QT_SYS_PATHS)
+    # Qt-specific vars
+    query_qmake(qt_install_prefix_dir QT_INSTALL_PREFIX TRY)
+    query_qmake(qt_plugins_dir QT_INSTALL_PLUGINS)
+
+    if(qt_install_prefix_dir STREQUAL "${CMAKE_INSTALL_PREFIX}")
+        file(RELATIVE_PATH qt_plugins_dir ${qt_install_prefix_dir} ${qt_plugins_dir})
+    endif()
+    _define_absolute(QTPLUGINDIR ${qt_plugins_dir}
+        "Qt plugins"
+         QT_PLUGIN_INSTALL_DIR)
+
+    query_qmake(qt_imports_dir QT_INSTALL_IMPORTS)
+
+    if(qt_install_prefix_dir STREQUAL "${CMAKE_INSTALL_PREFIX}")
+        file(RELATIVE_PATH qt_imports_dir ${qt_install_prefix_dir} ${qt_imports_dir})
+    endif()
+    _define_absolute(QTQUICKIMPORTSDIR ${qt_imports_dir}
+        "QtQuick1 imports"
+        IMPORTS_INSTALL_DIR)
+
+    query_qmake(qt_qml_dir QT_INSTALL_QML)
+
+    if(qt_install_prefix_dir STREQUAL "${CMAKE_INSTALL_PREFIX}")
+        file(RELATIVE_PATH qt_qml_dir ${qt_install_prefix_dir} ${qt_qml_dir})
+    endif()
+    _define_absolute(QMLDIR ${qt_qml_dir}
+        "QtQuick2 imports"
+        QML_INSTALL_DIR)
+else()
+    set(_pluginsDirParent LIBDIR)
+    if (ANDROID)
+        set(_pluginsDirParent)
+        #androiddeployqt wants plugins right in the prefix
+    endif()
+    _define_relative(QTPLUGINDIR "${_pluginsDirParent}" "plugins"
+        "Qt plugins"
+        QT_PLUGIN_INSTALL_DIR)
+
+    _define_relative(QTQUICKIMPORTSDIR QTPLUGINDIR "imports"
+        "QtQuick1 imports"
+        IMPORTS_INSTALL_DIR)
+
+    _define_relative(QMLDIR LIBDIR "qml"
+        "QtQuick2 imports"
+        QML_INSTALL_DIR)
+endif()
+
+_define_non_cache(INCLUDEDIR_KF5 "${CMAKE_INSTALL_INCLUDEDIR}/KF5")
+if(NOT KDE_INSTALL_DIRS_NO_DEPRECATED)
+    set(KF5_INCLUDE_INSTALL_DIR "${CMAKE_INSTALL_INCLUDEDIR_KF5}")
+endif()
+
+
+_define_non_cache(DATADIR_KF5 "${CMAKE_INSTALL_DATADIR}/kf5")
+if(NOT KDE_INSTALL_DIRS_NO_DEPRECATED)
+    set(KF5_DATA_INSTALL_DIR "${CMAKE_INSTALL_DATADIR_KF5}")
+endif()
+
+# Qt-specific data vars
+if(KDE_INSTALL_USE_QT_SYS_PATHS)
+    query_qmake(qt_docs_dir QT_INSTALL_DOCS)
+
+    _define_absolute(QTQCHDIR ${qt_docs_dir}
+        "documentation bundles in QCH format for Qt-extending libraries")
+else()
+    _define_relative(QTQCHDIR DATAROOTDIR "doc/qch"
+        "documentation bundles in QCH format for Qt-extending libraries")
+endif()
+
+
+# KDE Framework-specific things
+_define_relative(KSERVICES5DIR DATAROOTDIR "kservices5"
+    "services for KDE Frameworks 5"
+    SERVICES_INSTALL_DIR)
+_define_relative(KSERVICETYPES5DIR DATAROOTDIR "kservicetypes5"
+    "service types for KDE Frameworks 5"
+    SERVICETYPES_INSTALL_DIR)
+_define_relative(KNOTIFY5RCDIR DATAROOTDIR "knotifications5"
+    "knotify description files"
+    KNOTIFYRC_INSTALL_DIR)
+_define_relative(KXMLGUI5DIR DATAROOTDIR "kxmlgui5"
+    "kxmlgui .rc files"
+    KXMLGUI_INSTALL_DIR)
+_define_relative(LOGGINGCATEGORIESDIR DATAROOTDIR "qlogging-categories5"
+    "Qt Logging categories files")
+
+
+# For more documentation see above.
+# Later on it will be possible to extend this for installing OSX frameworks
+# The COMPONENT Devel argument has the effect that static libraries belong to the
+# "Devel" install component. If we use this also for all install() commands
+# for header files, it will be possible to install
+#   -everything: make install OR cmake -P cmake_install.cmake
+#   -only the development files: cmake -DCOMPONENT=Devel -P cmake_install.cmake
+#   -everything except the development files: cmake -DCOMPONENT=Unspecified -P cmake_install.cmake
+# This can then also be used for packaging with cpack.
+# FIXME: why is INCLUDES (only) set for ARCHIVE targets?
+set(KF5_INSTALL_TARGETS_DEFAULT_ARGS  RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
+                                      LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+                                      ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}" COMPONENT Devel
+                                      INCLUDES DESTINATION "${CMAKE_INSTALL_INCLUDEDIR_KF5}"
+)
+
+# on the Mac support an extra install directory for application bundles
+if(APPLE)
+    set(KF5_INSTALL_TARGETS_DEFAULT_ARGS  ${KF5_INSTALL_TARGETS_DEFAULT_ARGS}
+                                          BUNDLE DESTINATION "${BUNDLE_INSTALL_DIR}" )
+endif()
+
+include(${CMAKE_CURRENT_LIST_DIR}/KDESetupPrefixScript.cmake)
diff --git a/kde-modules/KDEInstallDirs6.cmake b/kde-modules/KDEInstallDirs6.cmake
new file mode 100644
index 00000000..e0e03c10
--- /dev/null
+++ b/kde-modules/KDEInstallDirs6.cmake
@@ -0,0 +1,332 @@
+# SPDX-FileCopyrightText: 2014-2015 Alex Merry <alex.merry@kde.org>
+# SPDX-FileCopyrightText: 2013 Stephen Kelly <steveire@gmail.com>
+# SPDX-FileCopyrightText: 2012 David Faure <faure@kde.org>
+# SPDX-FileCopyrightText: 2007 Matthias Kretz <kretz@kde.org>
+# SPDX-FileCopyrightText: 2006-2007 Laurent Montel <montel@kde.org>
+# SPDX-FileCopyrightText: 2006-2013 Alex Neundorf <neundorf@kde.org>
+# SPDX-FileCopyrightText: 2021 Volker Krause <vkrause@kde.org>
+#
+# SPDX-License-Identifier: BSD-3-Clause
+
+#[=======================================================================[.rst:
+KDEInstallDirs6
+---------------
+
+Define KDE standard installation directories for Qt6/KF6 based software.
+
+Note that none of the variables defined by this module provide any
+information about the location of already-installed KDE software.
+
+Also sets ``CMAKE_INSTALL_PREFIX`` to the installation prefix of ECM,
+unless that variable has been already explicitly set by something else.
+
+Inclusion of this module defines the following variables:
+
+``KDE_INSTALL_<dir>``
+    destination for files of a given type
+``KDE_INSTALL_FULL_<dir>``
+    corresponding absolute path
+
+where ``<dir>`` is one of (default values in parentheses and alternative,
+deprecated variable name in square brackets):
+
+``BUNDLEDIR``
+    application bundles (``/Applications/KDE``) [``BUNDLE_INSTALL_DIR``]
+``EXECROOTDIR``
+    executables and libraries (``<empty>``) [``EXEC_INSTALL_PREFIX``]
+``BINDIR``
+    user executables (``EXECROOTDIR/bin``) [``BIN_INSTALL_DIR``]
+``SBINDIR``
+    system admin executables (``EXECROOTDIR/sbin``) [``SBIN_INSTALL_DIR``]
+``LIBDIR``
+    object code libraries (``EXECROOTDIR/lib``, ``EXECROOTDIR/lib64`` or
+    ``EXECROOTDIR/lib/<multiarch-tuple`` on Debian) [``LIB_INSTALL_DIR``]
+``LIBEXECDIR``
+    executables for internal use by programs and libraries (``BINDIR`` on
+    Windows, ``LIBDIR/libexec`` otherwise) [``LIBEXEC_INSTALL_DIR``]
+``CMAKEPACKAGEDIR``
+    CMake packages, including config files (``LIBDIR/cmake``)
+    [``CMAKECONFIG_INSTALL_PREFIX``]
+``QTPLUGINDIR``
+    Qt plugins (``LIBDIR/plugins`` or qmake-qt5's ``QT_INSTALL_PLUGINS``) [``QT_PLUGIN_INSTALL_DIR``]
+``PLUGINDIR``
+    Plugins (``QTPLUGINDIR``) [``PLUGIN_INSTALL_DIR``]
+``QMLDIR``
+    QtQuick2 imports (``LIBDIR/qml`` or qmake-qt5's ``QT_INSTALL_QML``) [``QML_INSTALL_DIR``]
+``INCLUDEDIR``
+    C and C++ header files (``include``) [``INCLUDE_INSTALL_DIR``]
+``LOCALSTATEDIR``
+    modifiable single-machine data (``var``)
+``SHAREDSTATEDIR``
+    modifiable architecture-independent data (``com``)
+``DATAROOTDIR``
+    read-only architecture-independent data root (``share``)
+    [``SHARE_INSTALL_PREFIX``]
+``DATADIR``
+    read-only architecture-independent data (``DATAROOTDIR``)
+    [``DATA_INSTALL_DIR``]
+``DOCBUNDLEDIR``
+    documentation bundles generated using kdoctools
+    (``DATAROOTDIR/doc/HTML``) [``HTML_INSTALL_DIR``]
+``KCFGDIR``
+    kconfig description files (``DATAROOTDIR/config.kcfg``)
+    [``KCFG_INSTALL_DIR``]
+``KCONFUPDATEDIR``
+    kconf_update scripts (``DATAROOTDIR/kconf_update``)
+    [``KCONF_UPDATE_INSTALL_DIR``]
+``KSERVICES6DIR``
+    services for KDE Frameworks 6 (``DATAROOTDIR/kservices6``)
+    [``SERVICES_INSTALL_DIR``]
+``KSERVICETYPES6DIR``
+    service types for KDE Frameworks 6 (``DATAROOTDIR/kservicetypes6``)
+    [``SERVICETYPES_INSTALL_DIR``]
+``KXMLGUI6DIR``
+    knotify description files (``DATAROOTDIR/kxmlgui6``)
+    [``KXMLGUI_INSTALL_DIR``]
+``KTEMPLATESDIR``
+    Kapptemplate and Kdevelop templates (``kdevappwizard/templates``)
+``KNOTIFY6RCDIR``
+    knotify description files (``DATAROOTDIR/knotifications6``)
+    [``KNOTIFYRC_INSTALL_DIR``]
+``ICONDIR``
+    icons (``DATAROOTDIR/icons``) [``ICON_INSTALL_DIR``]
+``LOCALEDIR``
+    knotify description files (``DATAROOTDIR/locale``)
+    [``LOCALE_INSTALL_DIR``]
+``SOUNDDIR``
+    sound files (``DATAROOTDIR/sounds``) [``SOUND_INSTALL_DIR``]
+``TEMPLATEDIR``
+    templates (``DATAROOTDIR/templates``) [``TEMPLATES_INSTALL_DIR``]
+``WALLPAPERDIR``
+    desktop wallpaper images (``DATAROOTDIR/wallpapers``)
+    [``WALLPAPER_INSTALL_DIR``]
+``APPDIR``
+    application desktop files (``DATAROOTDIR/applications``) Since 1.1.0.
+    [``XDG_APPS_INSTALL_DIR``]
+``DESKTOPDIR``
+    desktop directories (``DATAROOTDIR/desktop-directories``)
+    [``XDG_DIRECTORY_INSTALL_DIR``]
+``MIMEDIR``
+    mime description files (``DATAROOTDIR/mime/packages``)
+    [``XDG_MIME_INSTALL_DIR``]
+``METAINFODIR``
+    AppStream component metadata files (``DATAROOTDIR/metainfo``)
+``QTQCHDIR``
+    documentation bundles in QCH format for Qt-extending libraries (``DATAROOTDIR/doc/qch`` or qmake-qt5's ``QT_INSTALL_DOCS``)
+``QCHDIR``
+    documentation bundles in QCH format (``DATAROOTDIR/doc/qch``)
+``MANDIR``
+    man documentation (``DATAROOTDIR/man``) [``MAN_INSTALL_DIR``]
+``INFODIR``
+    info documentation (``DATAROOTDIR/info``)
+``DBUSDIR``
+    D-Bus (``DATAROOTDIR/dbus-1``)
+``DBUSINTERFACEDIR``
+    D-Bus interfaces (``DBUSDIR/interfaces``)
+    [``DBUS_INTERFACES_INSTALL_DIR``]
+``DBUSSERVICEDIR``
+    D-Bus session services (``DBUSDIR/services``)
+    [``DBUS_SERVICES_INSTALL_DIR``]
+``DBUSSYSTEMSERVICEDIR``
+    D-Bus system services (``DBUSDIR/system-services``)
+    [``DBUS_SYSTEM_SERVICES_INSTALL_DIR``]
+``SYSCONFDIR``
+    read-only single-machine data
+    (``etc``, or ``/etc`` if ``CMAKE_INSTALL_PREFIX`` is ``/usr``)
+    [``SYSCONF_INSTALL_DIR``]
+``CONFDIR``
+    application configuration files (``SYSCONFDIR/xdg``)
+    [``CONFIG_INSTALL_DIR``]
+``AUTOSTARTDIR``
+    autostart files (``CONFDIR/autostart``) [``AUTOSTART_INSTALL_DIR``]
+``LOGGINGCATEGORIESDIR``
+    Qt logging categories files directory (``DATAROOTDIR/qlogging-categories6``)
+``JARDIR``
+    Java AAR/JAR files for Android.
+``SYSTEMDUNITDIR``
+    Systemd Units (``lib/systemd``)
+    [``SYSTEMD_UNIT_INSTALL_DIR``].
+``SYSTEMDUSERUNITDIR``
+    Systemd User Units (``lib/systemd/user``)
+    [``SYSTEMD_USER_UNIT_INSTALL_DIR``].
+
+TODO TODO TODO
+If ``KDE_INSTALL_USE_QT_SYS_PATHS`` is set to TRUE before including this
+module, the default values for some variables are instead queried from
+Qt6's qmake (where mentioned in the parentheses above).
+If not set, it will default to TRUE if Qt6's qmake is found and
+it's ``QT_INSTALL_PREFIX`` is the same as ``CMAKE_INSTALL_PREFIX``,
+otherwise default to FALSE.
+This variable should NOT be set from within CMakeLists.txt files, instead
+is intended to be set manually when configuring a project which uses
+KDEInstallDirs (e.g. by packagers).
+
+If ``KDE_INSTALL_DIRS_NO_DEPRECATED`` is set to TRUE before including this
+module, the deprecated variables (listed in the square brackets above) are
+not defined.
+
+In addition, for each ``KDE_INSTALL_*`` variable, an equivalent
+``CMAKE_INSTALL_*`` variable is defined. If
+``KDE_INSTALL_DIRS_NO_DEPRECATED`` is set to TRUE, only those variables
+defined by the ``GNUInstallDirs`` module (shipped with CMake) are defined.
+If ``KDE_INSTALL_DIRS_NO_CMAKE_VARIABLES`` is set to TRUE, no variables with
+a ``CMAKE_`` prefix will be defined by this module (other than
+CMAKE_INSTALL_DEFAULT_COMPONENT_NAME - see below).
+
+The ``KDE_INSTALL_<dir>`` variables (or their ``CMAKE_INSTALL_<dir>`` or
+deprecated counterparts) may be passed to the DESTINATION options of
+``install()`` commands for the corresponding file type.  They are set in the
+CMake cache, and so the defaults above can be overridden by users.
+
+Note that the ``KDE_INSTALL_<dir>``, ``CMAKE_INSTALL_<dir>`` or deprecated
+form of the variable can be changed using CMake command line variable
+definitions; in either case, all forms of the variable will be affected. The
+effect of passing multiple forms of the same variable on the command line
+(such as ``KDE_INSTALL_BINDIR`` and ``CMAKE_INSTALL_BINDIR`` is undefined.
+
+The variable ``KDE_INSTALL_TARGETS_DEFAULT_ARGS`` is also defined (along with
+the deprecated form ``INSTALL_TARGETS_DEFAULT_ARGS``).  This should be used
+when libraries or user-executable applications are installed, in the
+following manner:
+
+.. code-block:: cmake
+
+  install(TARGETS mylib myapp ${KDE_INSTALL_TARGETS_DEFAULT_ARGS})
+
+It MUST NOT be used for installing plugins, system admin executables or
+executables only intended for use internally by other code.  Those should use
+``KDE_INSTALL_PLUGINDIR``, ``KDE_INSTALL_SBINDIR`` or
+``KDE_INSTALL_LIBEXECDIR`` respectively.
+
+Additionally, ``CMAKE_INSTALL_DEFAULT_COMPONENT_NAME`` will be set to
+``${PROJECT_NAME}`` to provide a sensible default for this CMake option.
+
+Note that mixing absolute and relative paths, particularly for ``BINDIR``,
+``LIBDIR`` and ``INCLUDEDIR``, can cause issues with exported targets. Given
+that the default values for these are relative paths, relative paths should
+be used on the command line when possible (eg: use
+``-DKDE_INSTALL_LIBDIR=lib64`` instead of
+``-DKDE_INSTALL_LIBDIR=/usr/lib/lib64`` to override the library directory).
+
+Since 5.82.0.
+
+The ``KDE_INSTALL_PREFIX_SCRIPT`` option will install a ${CMAKE_INSTALL_PREFIX}/prefix.sh
+file that allows to easily incorporate the necessary environment variables
+for the prefix into a process.
+#]=======================================================================]
+
+
+include(${CMAKE_CURRENT_LIST_DIR}/KDEInstallDirsCommon.cmake)
+
+if(WIN32)
+    _define_non_cache(LIBEXECDIR_KF6 "${CMAKE_INSTALL_LIBEXECDIR}")
+else()
+    _define_non_cache(LIBEXECDIR_KF6 "${CMAKE_INSTALL_LIBEXECDIR}/kf6")
+endif()
+
+# TODO TODO TODO
+#include("${ECM_MODULE_DIR}/ECMQueryQmake.cmake")
+
+set(_default_KDE_INSTALL_USE_QT_SYS_PATHS OFF)
+if(NOT DEFINED KDE_INSTALL_USE_QT_SYS_PATHS)
+    query_qmake(qt_install_prefix_dir QT_INSTALL_PREFIX TRY)
+    if(qt_install_prefix_dir STREQUAL "${CMAKE_INSTALL_PREFIX}")
+        message(STATUS "Installing in the same prefix as Qt, adopting their path scheme.")
+        set(_default_KDE_INSTALL_USE_QT_SYS_PATHS ON)
+    endif()
+endif()
+
+option (KDE_INSTALL_USE_QT_SYS_PATHS "Install mkspecs files, QCH files for Qt-based libs, Plugins and Imports to the Qt 5 install dir" "${_default_KDE_INSTALL_USE_QT_SYS_PATHS}")
+# TODO TODO TODO
+#if(KDE_INSTALL_USE_QT_SYS_PATHS)
+#    # Qt-specific vars
+#    query_qmake(qt_install_prefix_dir QT_INSTALL_PREFIX TRY)
+#    query_qmake(qt_plugins_dir QT_INSTALL_PLUGINS)
+#
+#    if(qt_install_prefix_dir STREQUAL "${CMAKE_INSTALL_PREFIX}")
+#        file(RELATIVE_PATH qt_plugins_dir ${qt_install_prefix_dir} ${qt_plugins_dir})
+#    endif()
+#    _define_absolute(QTPLUGINDIR ${qt_plugins_dir}
+#        "Qt plugins"
+#         QT_PLUGIN_INSTALL_DIR)
+#
+#    query_qmake(qt_qml_dir QT_INSTALL_QML)
+#
+#    if(qt_install_prefix_dir STREQUAL "${CMAKE_INSTALL_PREFIX}")
+#        file(RELATIVE_PATH qt_qml_dir ${qt_install_prefix_dir} ${qt_qml_dir})
+#    endif()
+#    _define_absolute(QMLDIR ${qt_qml_dir}
+#        "QtQuick2 imports"
+#        QML_INSTALL_DIR)
+#else()
+    set(_pluginsDirParent LIBDIR)
+    if (ANDROID)
+        set(_pluginsDirParent)
+        #androiddeployqt wants plugins right in the prefix
+    endif()
+    _define_relative(QTPLUGINDIR "${_pluginsDirParent}" "plugins"
+        "Qt plugins"
+        QT_PLUGIN_INSTALL_DIR)
+
+    _define_relative(QMLDIR LIBDIR "qml"
+        "QtQuick2 imports"
+        QML_INSTALL_DIR)
+#endif()
+
+_define_non_cache(INCLUDEDIR_KF6 "${CMAKE_INSTALL_INCLUDEDIR}/KF6")
+
+_define_non_cache(DATADIR_KF5 "${CMAKE_INSTALL_DATADIR}/kf6")
+
+# TODO TODO TODO
+# Qt-specific data vars
+#if(KDE_INSTALL_USE_QT_SYS_PATHS)
+#    query_qmake(qt_docs_dir QT_INSTALL_DOCS)
+#
+#    _define_absolute(QTQCHDIR ${qt_docs_dir}
+#        "documentation bundles in QCH format for Qt-extending libraries")
+#else()
+    _define_relative(QTQCHDIR DATAROOTDIR "doc/qch"
+        "documentation bundles in QCH format for Qt-extending libraries")
+#endif()
+
+
+# KDE Framework-specific things
+_define_relative(KSERVICES6DIR DATAROOTDIR "kservices6"
+    "services for KDE Frameworks 6"
+    SERVICES_INSTALL_DIR)
+_define_relative(KSERVICETYPES6DIR DATAROOTDIR "kservicetypes6"
+    "service types for KDE Frameworks 6"
+    SERVICETYPES_INSTALL_DIR)
+_define_relative(KNOTIFY6RCDIR DATAROOTDIR "knotifications6"
+    "knotify description files"
+    KNOTIFYRC_INSTALL_DIR)
+_define_relative(KXMLGUI6DIR DATAROOTDIR "kxmlgui6"
+    "kxmlgui .rc files"
+    KXMLGUI_INSTALL_DIR)
+_define_relative(LOGGINGCATEGORIESDIR DATAROOTDIR "qlogging-categories6"
+    "Qt Logging categories files")
+
+
+# For more documentation see above.
+# Later on it will be possible to extend this for installing OSX frameworks
+# The COMPONENT Devel argument has the effect that static libraries belong to the
+# "Devel" install component. If we use this also for all install() commands
+# for header files, it will be possible to install
+#   -everything: make install OR cmake -P cmake_install.cmake
+#   -only the development files: cmake -DCOMPONENT=Devel -P cmake_install.cmake
+#   -everything except the development files: cmake -DCOMPONENT=Unspecified -P cmake_install.cmake
+# This can then also be used for packaging with cpack.
+# FIXME: why is INCLUDES (only) set for ARCHIVE targets?
+set(KF6_INSTALL_TARGETS_DEFAULT_ARGS  RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
+                                      LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+                                      ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}" COMPONENT Devel
+                                      INCLUDES DESTINATION "${CMAKE_INSTALL_INCLUDEDIR_KF6}"
+)
+
+# on the Mac support an extra install directory for application bundles
+if(APPLE)
+    set(KF6_INSTALL_TARGETS_DEFAULT_ARGS  ${KF6_INSTALL_TARGETS_DEFAULT_ARGS}
+                                          BUNDLE DESTINATION "${BUNDLE_INSTALL_DIR}" )
+endif()
+
+include(${CMAKE_CURRENT_LIST_DIR}/KDESetupPrefixScript.cmake)
diff --git a/kde-modules/KDEInstallDirsCommon.cmake b/kde-modules/KDEInstallDirsCommon.cmake
new file mode 100644
index 00000000..a492a14d
--- /dev/null
+++ b/kde-modules/KDEInstallDirsCommon.cmake
@@ -0,0 +1,392 @@
+# SPDX-FileCopyrightText: 2014-2015 Alex Merry <alex.merry@kde.org>
+# SPDX-FileCopyrightText: 2013 Stephen Kelly <steveire@gmail.com>
+# SPDX-FileCopyrightText: 2012 David Faure <faure@kde.org>
+# SPDX-FileCopyrightText: 2007 Matthias Kretz <kretz@kde.org>
+# SPDX-FileCopyrightText: 2006-2007 Laurent Montel <montel@kde.org>
+# SPDX-FileCopyrightText: 2006-2013 Alex Neundorf <neundorf@kde.org>
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+# Common implementation details of KDEInstallDirsX.cmake, not public API.
+#
+
+# Figure out what the default install directory for libraries should be.
+# This is based on the logic in GNUInstallDirs, but simplified (the
+# GNUInstallDirs code deals with re-configuring, but that is dealt with
+# by the _define_* macros in this module).
+set(_LIBDIR_DEFAULT "lib")
+# Override this default 'lib' with 'lib64' if:
+#  - we are on a Linux, kFreeBSD or Hurd system but NOT cross-compiling
+#  - we are NOT on debian
+#  - we are NOT on flatpak
+#  - we are on a 64 bits system
+# reason is: amd64 ABI: http://www.x86-64.org/documentation/abi.pdf
+# For Debian with multiarch, use 'lib/${CMAKE_LIBRARY_ARCHITECTURE}' if
+# CMAKE_LIBRARY_ARCHITECTURE is set (which contains e.g. "i386-linux-gnu"
+# See https://wiki.debian.org/Multiarch
+if((CMAKE_SYSTEM_NAME MATCHES "Linux|kFreeBSD" OR CMAKE_SYSTEM_NAME STREQUAL "GNU")
+   AND NOT CMAKE_CROSSCOMPILING
+   AND NOT EXISTS "/etc/arch-release"
+   AND NOT DEFINED ENV{FLATPAK_ID})
+  if (EXISTS "/etc/debian_version") # is this a debian system ?
+    if(CMAKE_LIBRARY_ARCHITECTURE)
+      set(_LIBDIR_DEFAULT "lib/${CMAKE_LIBRARY_ARCHITECTURE}")
+    endif()
+  else() # not debian, rely on CMAKE_SIZEOF_VOID_P:
+    if(NOT DEFINED CMAKE_SIZEOF_VOID_P)
+      message(AUTHOR_WARNING
+        "Unable to determine default LIB_INSTALL_LIBDIR directory because no target architecture is known. "
+        "Please enable at least one language before including KDEInstallDirs.")
+    else()
+      if("${CMAKE_SIZEOF_VOID_P}" EQUAL "8")
+        set(_LIBDIR_DEFAULT "lib64")
+      endif()
+    endif()
+  endif()
+endif()
+
+set(_gnu_install_dirs_vars
+    BINDIR
+    SBINDIR
+    LIBEXECDIR
+    SYSCONFDIR
+    SHAREDSTATEDIR
+    LOCALSTATEDIR
+    LIBDIR
+    INCLUDEDIR
+    OLDINCLUDEDIR
+    DATAROOTDIR
+    DATADIR
+    INFODIR
+    LOCALEDIR
+    MANDIR
+    DOCDIR)
+
+# Macro for variables that are relative to another variable. We store an empty
+# value in the cache (for documentation/GUI cache editor purposes), and store
+# the default value in a local variable. If the cache variable is ever set to
+# something non-empty, the local variable will no longer be set. However, if
+# the cache variable remains (or is set to be) empty, the value will be
+# relative to that of the parent variable.
+#
+# varname:   the variable name suffix (eg: BINDIR for KDE_INSTALL_BINDIR)
+# parent:    the variable suffix of the variable this is relative to
+#            (eg: DATAROOTDIR for KDE_INSTALL_DATAROOTDIR)
+# subdir:    the path of the default value of KDE_INSTALL_${varname}
+#            relative to KDE_INSTALL_${parent}: no leading /
+# docstring: documentation about the variable (not including the default value)
+# oldstylename (optional): the old-style name of the variable
+macro(_define_relative varname parent subdir docstring)
+    set(_oldstylename)
+    if(NOT KDE_INSTALL_DIRS_NO_DEPRECATED AND ${ARGC} GREATER 4)
+        set(_oldstylename "${ARGV4}")
+    endif()
+    set(_cmakename)
+    if(NOT KDE_INSTALL_DIRS_NO_CMAKE_VARIABLES)
+        list(FIND _gnu_install_dirs_vars "${varname}" _list_offset)
+        set(_cmakename_is_deprecated FALSE)
+        if(NOT KDE_INSTALL_DIRS_NO_DEPRECATED OR NOT _list_offset EQUAL -1)
+            set(_cmakename CMAKE_INSTALL_${varname})
+            if(_list_offset EQUAL -1)
+                set(_cmakename_is_deprecated TRUE)
+            endif()
+        endif()
+    endif()
+
+    # Surprisingly complex logic to deal with joining paths.
+    # Note that we cannot use arg vars directly in if() because macro args are
+    # not proper variables.
+    set(_parent "${parent}")
+    set(_subdir "${subdir}")
+    if(_parent AND _subdir)
+        set(_docpath "${_parent}/${_subdir}")
+        if(KDE_INSTALL_${_parent})
+            set(_realpath "${KDE_INSTALL_${_parent}}/${_subdir}")
+        else()
+            set(_realpath "${_subdir}")
+        endif()
+    elseif(_parent)
+        set(_docpath "${_parent}")
+        set(_realpath "${KDE_INSTALL_${_parent}}")
+    else()
+        set(_docpath "${_subdir}")
+        set(_realpath "${_subdir}")
+    endif()
+
+    if(KDE_INSTALL_${varname})
+        # make sure the cache documentation is set correctly
+        get_property(_iscached CACHE KDE_INSTALL_${varname} PROPERTY VALUE SET)
+        if (_iscached)
+            # make sure the docs are still set if it was passed on the command line
+            set_property(CACHE KDE_INSTALL_${varname}
+                PROPERTY HELPSTRING "${docstring} (${_docpath})")
+            # make sure the type is correct if it was passed on the command line
+            set_property(CACHE KDE_INSTALL_${varname}
+                PROPERTY TYPE PATH)
+        endif()
+    elseif(${_oldstylename})
+       message(DEPRECATION "${_oldstylename} is deprecated, use KDE_INSTALL_${varname} instead.")
+        # The old name was given (probably on the command line): move
+        # it to the new name
+        set(KDE_INSTALL_${varname} "${${_oldstylename}}"
+            CACHE PATH
+                  "${docstring} (${_docpath})"
+                  FORCE)
+    elseif(${_cmakename})
+        if(_cmakename_is_deprecated)
+            message(DEPRECATION "${_cmakename} is deprecated, use KDE_INSTALL_${varname} instead.")
+        endif()
+        # The CMAKE_ name was given (probably on the command line): move
+        # it to the new name
+        set(KDE_INSTALL_${varname} "${${_cmakename}}"
+            CACHE PATH
+                  "${docstring} (${_docpath})"
+                  FORCE)
+    else()
+        # insert an empty value into the cache, indicating the default
+        # should be used (including compatibility vars above)
+        set(KDE_INSTALL_${varname} ""
+            CACHE PATH "${docstring} (${_docpath})")
+        set(KDE_INSTALL_${varname} "${_realpath}")
+    endif()
+
+    mark_as_advanced(KDE_INSTALL_${varname})
+
+    if(NOT IS_ABSOLUTE ${KDE_INSTALL_${varname}})
+        set(KDE_INSTALL_FULL_${varname}
+            "${CMAKE_INSTALL_PREFIX}/${KDE_INSTALL_${varname}}")
+    else()
+        set(KDE_INSTALL_FULL_${varname} "${KDE_INSTALL_${varname}}")
+    endif()
+
+    # Override compatibility vars at runtime, even though we don't touch
+    # them in the cache; this way, we keep the variables in sync where
+    # KDEInstallDirs is included, but don't interfere with, say,
+    # GNUInstallDirs in a parallel part of the CMake tree.
+    if(_cmakename)
+        set(${_cmakename} "${KDE_INSTALL_${varname}}")
+        set(CMAKE_INSTALL_FULL_${varname} "${KDE_INSTALL_FULL_${varname}}")
+    endif()
+
+    if(_oldstylename)
+        set(${_oldstylename} "${KDE_INSTALL_${varname}}")
+    endif()
+endmacro()
+
+# varname:   the variable name suffix (eg: BINDIR for KDE_INSTALL_BINDIR)
+# dir:       the relative path of the default value of KDE_INSTALL_${varname}
+#            relative to CMAKE_INSTALL_PREFIX: no leading /
+# docstring: documentation about the variable (not including the default value)
+# oldstylename (optional): the old-style name of the variable
+macro(_define_absolute varname dir docstring)
+    _define_relative("${varname}" "" "${dir}" "${docstring}" ${ARGN})
+endmacro()
+
+macro(_define_non_cache varname value)
+    set(KDE_INSTALL_${varname} "${value}")
+    if(NOT IS_ABSOLUTE ${KDE_INSTALL_${varname}})
+        set(KDE_INSTALL_FULL_${varname}
+            "${CMAKE_INSTALL_PREFIX}/${KDE_INSTALL_${varname}}")
+    else()
+        set(KDE_INSTALL_FULL_${varname} "${KDE_INSTALL_${varname}}")
+    endif()
+
+    if(NOT KDE_INSTALL_DIRS_NO_CMAKE_VARIABLES)
+        list(FIND _gnu_install_dirs_vars "${varname}" _list_offset)
+        if(NOT KDE_INSTALL_DIRS_NO_DEPRECATED OR NOT _list_offset EQUAL -1)
+            set(CMAKE_INSTALL_${varname} "${KDE_INSTALL_${varname}}")
+            set(CMAKE_INSTALL_FULL_${varname} "${KDE_INSTALL_FULL_${varname}}")
+        endif()
+    endif()
+endmacro()
+
+if(APPLE)
+    _define_absolute(BUNDLEDIR "/Applications/KDE"
+        "application bundles"
+        BUNDLE_INSTALL_DIR)
+endif()
+
+# Only supported since cmake 3.7
+if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
+    set(CMAKE_INSTALL_PREFIX "${ECM_PREFIX}" CACHE PATH "Install path prefix" FORCE)
+endif()
+
+_define_absolute(EXECROOTDIR ""
+    "executables and libraries"
+    EXEC_INSTALL_PREFIX)
+
+_define_relative(BINDIR EXECROOTDIR "bin"
+    "user executables"
+    BIN_INSTALL_DIR)
+_define_relative(SBINDIR EXECROOTDIR "sbin"
+    "system admin executables"
+    SBIN_INSTALL_DIR)
+_define_relative(LIBDIR EXECROOTDIR "${_LIBDIR_DEFAULT}"
+    "object code libraries"
+    LIB_INSTALL_DIR)
+
+if(WIN32)
+    _define_relative(LIBEXECDIR BINDIR ""
+        "executables for internal use by programs and libraries"
+        LIBEXEC_INSTALL_DIR)
+else()
+    _define_relative(LIBEXECDIR LIBDIR "libexec"
+        "executables for internal use by programs and libraries"
+        LIBEXEC_INSTALL_DIR)
+endif()
+
+_define_relative(CMAKEPACKAGEDIR LIBDIR "cmake"
+    "CMake packages, including config files"
+    CMAKECONFIG_INSTALL_PREFIX)
+
+_define_relative(PLUGINDIR QTPLUGINDIR ""
+    "Plugins"
+    PLUGIN_INSTALL_DIR)
+
+_define_absolute(INCLUDEDIR "include"
+    "C and C++ header files"
+    INCLUDE_INSTALL_DIR)
+
+_define_absolute(LOCALSTATEDIR "var"
+    "modifiable single-machine data")
+
+_define_absolute(SHAREDSTATEDIR "com"
+    "modifiable architecture-independent data")
+
+if (WIN32)
+    _define_relative(DATAROOTDIR BINDIR "data"
+        "read-only architecture-independent data root"
+        SHARE_INSTALL_PREFIX)
+else()
+    _define_absolute(DATAROOTDIR "share"
+        "read-only architecture-independent data root"
+        SHARE_INSTALL_PREFIX)
+endif()
+
+_define_relative(DATADIR DATAROOTDIR ""
+    "read-only architecture-independent data"
+    DATA_INSTALL_DIR)
+
+# KDE Framework-specific things
+_define_relative(DOCBUNDLEDIR DATAROOTDIR "doc/HTML"
+    "documentation bundles generated using kdoctools"
+    HTML_INSTALL_DIR)
+_define_relative(KCFGDIR DATAROOTDIR "config.kcfg"
+    "kconfig description files"
+    KCFG_INSTALL_DIR)
+_define_relative(KCONFUPDATEDIR DATAROOTDIR "kconf_update"
+    "kconf_update scripts"
+    KCONF_UPDATE_INSTALL_DIR)
+_define_relative(KAPPTEMPLATESDIR DATAROOTDIR "kdevappwizard/templates"
+    "KAppTemplate and KDevelop templates"
+    KDE_INSTALL_KTEMPLATESDIR
+    )
+_define_relative(KFILETEMPLATESDIR DATAROOTDIR "kdevfiletemplates/templates"
+    "KDevelop file templates")
+_define_relative(JARDIR "" "jar"
+    "Java AAR/JAR files for Android")
+
+
+# Cross-desktop or other system things
+_define_relative(ICONDIR DATAROOTDIR "icons"
+    "icons"
+    ICON_INSTALL_DIR)
+_define_relative(LOCALEDIR DATAROOTDIR "locale"
+    "knotify description files"
+    LOCALE_INSTALL_DIR)
+_define_relative(SOUNDDIR DATAROOTDIR "sounds"
+    "sound files"
+    SOUND_INSTALL_DIR)
+_define_relative(TEMPLATEDIR DATAROOTDIR "templates"
+    "templates"
+    TEMPLATES_INSTALL_DIR)
+_define_relative(WALLPAPERDIR DATAROOTDIR "wallpapers"
+    "desktop wallpaper images"
+    WALLPAPER_INSTALL_DIR)
+_define_relative(APPDIR DATAROOTDIR "applications"
+    "application desktop files"
+    XDG_APPS_INSTALL_DIR)
+_define_relative(DESKTOPDIR DATAROOTDIR "desktop-directories"
+    "desktop directories"
+    XDG_DIRECTORY_INSTALL_DIR)
+_define_relative(MIMEDIR DATAROOTDIR "mime/packages"
+    "mime description files"
+    XDG_MIME_INSTALL_DIR)
+_define_relative(METAINFODIR DATAROOTDIR "metainfo"
+    "AppStream component metadata")
+_define_relative(QCHDIR DATAROOTDIR "doc/qch"
+    "documentation bundles in QCH format")
+_define_relative(MANDIR DATAROOTDIR "man"
+    "man documentation"
+    MAN_INSTALL_DIR)
+_define_relative(INFODIR DATAROOTDIR "info"
+    "info documentation")
+_define_relative(DBUSDIR DATAROOTDIR "dbus-1"
+    "D-Bus")
+_define_relative(DBUSINTERFACEDIR DBUSDIR "interfaces"
+    "D-Bus interfaces"
+    DBUS_INTERFACES_INSTALL_DIR)
+_define_relative(DBUSSERVICEDIR DBUSDIR "services"
+    "D-Bus session services"
+    DBUS_SERVICES_INSTALL_DIR)
+_define_relative(DBUSSYSTEMSERVICEDIR DBUSDIR "system-services"
+    "D-Bus system services"
+    DBUS_SYSTEM_SERVICES_INSTALL_DIR)
+_define_relative(SYSTEMDUNITDIR CMAKE_INSTALL_PREFIX "lib/systemd"
+    "Systemd units"
+    SYSTEMD_UNIT_INSTALL_DIR)
+_define_relative(SYSTEMDUSERUNITDIR SYSTEMDUNITDIR "user"
+    "Systemd user units"
+    SYSTEMD_USER_UNIT_INSTALL_DIR)
+
+
+set(_default_sysconf_dir "etc")
+if (CMAKE_INSTALL_PREFIX STREQUAL "/usr")
+    set(_default_sysconf_dir "/etc")
+endif()
+
+_define_absolute(SYSCONFDIR "${_default_sysconf_dir}"
+    "read-only single-machine data"
+    SYSCONF_INSTALL_DIR)
+_define_relative(CONFDIR SYSCONFDIR "xdg"
+    "application configuration files"
+    CONFIG_INSTALL_DIR)
+_define_relative(AUTOSTARTDIR CONFDIR "autostart"
+    "autostart files"
+    AUTOSTART_INSTALL_DIR)
+
+
+set(_mixed_core_path_styles FALSE)
+if (IS_ABSOLUTE "${KDE_INSTALL_BINDIR}")
+    if (NOT IS_ABSOLUTE "${KDE_INSTALL_LIBDIR}" OR NOT IS_ABSOLUTE "${KDE_INSTALL_INCLUDEDIR}")
+        set(_mixed_core_path_styles )
+    endif()
+else()
+    if (IS_ABSOLUTE "${KDE_INSTALL_LIBDIR}" OR IS_ABSOLUTE "${KDE_INSTALL_INCLUDEDIR}")
+        set(_mixed_core_path_styles TRUE)
+    endif()
+endif()
+if (_mixed_core_path_styles)
+    message(WARNING "KDE_INSTALL_BINDIR, KDE_INSTALL_LIBDIR and KDE_INSTALL_INCLUDEDIR should either all be absolute paths or all be relative paths.")
+endif()
+
+
+set(KDE_INSTALL_TARGETS_DEFAULT_ARGS  RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
+                                      LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+                                      ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}" COMPONENT Devel
+                                      INCLUDES DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}"
+)
+if(APPLE)
+    set(KDE_INSTALL_TARGETS_DEFAULT_ARGS  ${KDE_INSTALL_TARGETS_DEFAULT_ARGS}
+                                          BUNDLE DESTINATION "${BUNDLE_INSTALL_DIR}" )
+endif()
+
+if(NOT KDE_INSTALL_DIRS_NO_DEPRECATED)
+    set(INSTALL_TARGETS_DEFAULT_ARGS ${KDE_INSTALL_TARGETS_DEFAULT_ARGS})
+endif()
+
+# new in cmake 2.8.9: this is used for all installed files which do not have a component set
+# so set the default component name to the name of the project, if a project name has been set:
+if(NOT "${PROJECT_NAME}" STREQUAL "Project")
+    set(CMAKE_INSTALL_DEFAULT_COMPONENT_NAME "${PROJECT_NAME}")
+endif()
diff --git a/kde-modules/KDESetupPrefixScript.cmake b/kde-modules/KDESetupPrefixScript.cmake
new file mode 100644
index 00000000..31da2683
--- /dev/null
+++ b/kde-modules/KDESetupPrefixScript.cmake
@@ -0,0 +1,27 @@
+# SPDX-FileCopyrightText: 2014-2015 Alex Merry <alex.merry@kde.org>
+# SPDX-FileCopyrightText: 2013 Stephen Kelly <steveire@gmail.com>
+# SPDX-FileCopyrightText: 2012 David Faure <faure@kde.org>
+# SPDX-FileCopyrightText: 2007 Matthias Kretz <kretz@kde.org>
+# SPDX-FileCopyrightText: 2006-2007 Laurent Montel <montel@kde.org>
+# SPDX-FileCopyrightText: 2006-2013 Alex Neundorf <neundorf@kde.org>
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+# Prefix script setup code shared between KDEInstallDirsX.cmake, not public API.
+#
+
+configure_file(${CMAKE_CURRENT_LIST_DIR}/prefix.sh.cmake ${CMAKE_CURRENT_BINARY_DIR}/prefix.sh @ONLY)
+
+find_program(FISH_EXECUTABLE fish)
+if(FISH_EXECUTABLE)
+    configure_file(${CMAKE_CURRENT_LIST_DIR}/prefix.sh.fish.cmake ${CMAKE_CURRENT_BINARY_DIR}/prefix.sh.fish @ONLY)
+endif()
+
+option(KDE_INSTALL_PREFIX_SCRIPT "Installs ${CMAKE_INSTALL_PREFIX}/prefix.sh that sets up the necessary environment variables" OFF)
+if(KDE_INSTALL_PREFIX_SCRIPT)
+    install(FILES ${CMAKE_CURRENT_BINARY_DIR}/prefix.sh DESTINATION ${CMAKE_INSTALL_PREFIX} PERMISSIONS OWNER_EXECUTE OWNER_WRITE OWNER_READ)
+endif()
+
+if(NOT KDE_INSTALL_USE_QT_SYS_PATHS)
+    message("Installing in ${CMAKE_INSTALL_PREFIX}. Run ${CMAKE_CURRENT_BINARY_DIR}/prefix.sh to set the environment for ${CMAKE_PROJECT_NAME}.")
+endif()
diff --git a/modules/QtVersionOption.cmake b/modules/QtVersionOption.cmake
new file mode 100644
index 00000000..1390f9db
--- /dev/null
+++ b/modules/QtVersionOption.cmake
@@ -0,0 +1,38 @@
+#.rst:
+# QtVersionOption
+# ---------------
+#
+# Adds a build option to select the major Qt version if necessary,
+# that is, if the major Qt version has not yet been determined otherwise
+# (e.g. by a corresponding find_package() call).
+#
+# This module is typically included by other modules requiring knowledge
+# about the major Qt version.
+#
+# ``QT_MAJOR_VERSION`` is defined to either be "5" or "6".
+#
+#
+# Since 5.82.0.
+
+#=============================================================================
+# SPDX-FileCopyrightText: 2021 Volker Krause <vkrause@kde.org>
+#
+# SPDX-License-Identifier: BSD-3-Clause
+
+if (DEFINED QT_MAJOR_VERSION)
+    return()
+endif()
+
+if (TARGET Qt5::Core)
+    set(QT_MAJOR_VERSION 5)
+elseif (TARGET Qt6::Core)
+    set(QT_MAJOR_VERSION 6)
+else()
+    option(BUILD_WITH_QT6 "Build against Qt 6" OFF)
+
+    if (BUILD_WITH_QT6)
+        set(QT_MAJOR_VERSION 6)
+    else()
+        set(QT_MAJOR_VERSION 5)
+    endif()
+endif()