install in kf<version>

runners/characters/CMakeLists.txt

 add_definitions(-DTRANSLATION_DOMAIN="plasma_runner_CharacterRunner")
 
-kcoreaddons_add_plugin(krunner_charrunner SOURCES charrunner.cpp INSTALL_NAMESPACE "kf5/krunner")
+kcoreaddons_add_plugin(krunner_charrunner SOURCES charrunner.cpp INSTALL_NAMESPACE "kf${QT_MAJOR_VERSION}/krunner")
 target_link_libraries(krunner_charrunner
     KF5::Runner
     KF5::I18n
 )
 
-kcoreaddons_add_plugin(kcm_krunner_charrunner INSTALL_NAMESPACE "kf5/krunner/kcms")
+kcoreaddons_add_plugin(kcm_krunner_charrunner INSTALL_NAMESPACE "kf${QT_MAJOR_VERSION}/krunner/kcms")
 target_sources(kcm_krunner_charrunner PRIVATE charrunner_config.cpp)
 ki18n_wrap_ui(kcm_krunner_charrunner charrunner_config.ui)
 target_link_libraries(kcm_krunner_charrunner

runners/converter/CMakeLists.txt

 add_definitions(-DTRANSLATION_DOMAIN=\"plasma_runner_converterrunner\")
 
-kcoreaddons_add_plugin(unitconverter SOURCES converterrunner.cpp INSTALL_NAMESPACE "kf5/krunner")
+kcoreaddons_add_plugin(unitconverter SOURCES converterrunner.cpp INSTALL_NAMESPACE "kf${QT_MAJOR_VERSION}/krunner")
 target_link_libraries(unitconverter
         KF5::I18n
         KF5::Runner

runners/datetime/CMakeLists.txt

 add_definitions(-DTRANSLATION_DOMAIN="plasma_runner_datetime")
 
-kcoreaddons_add_plugin(krunner_datetime SOURCES datetimerunner.cpp INSTALL_NAMESPACE "kf5/krunner")
+kcoreaddons_add_plugin(krunner_datetime SOURCES datetimerunner.cpp INSTALL_NAMESPACE "kf${QT_MAJOR_VERSION}/krunner")
 target_link_libraries(krunner_datetime
     KF5::Runner
     KF5::KIOWidgets

runners/dictionary/CMakeLists.txt

 add_definitions(-DTRANSLATION_DOMAIN="plasma_runner_krunner_dictionary")
 
-kcoreaddons_add_plugin(krunner_dictionary SOURCES ${dictionaryrunner_SRCS} INSTALL_NAMESPACE "kf5/krunner")
+kcoreaddons_add_plugin(krunner_dictionary SOURCES ${dictionaryrunner_SRCS} INSTALL_NAMESPACE "kf${QT_MAJOR_VERSION}/krunner")
 target_sources(krunner_dictionary PRIVATE dictionaryrunner.cpp)
 target_link_libraries(krunner_dictionary KF5::Runner KF5::I18n engine_dict_static)
 
-kcoreaddons_add_plugin(kcm_krunner_dictionary INSTALL_NAMESPACE "kf5/krunner/kcms")
+kcoreaddons_add_plugin(kcm_krunner_dictionary INSTALL_NAMESPACE "kf${QT_MAJOR_VERSION}/krunner/kcms")
 target_sources(kcm_krunner_dictionary PRIVATE dictionaryrunner_config.cpp)
 target_link_libraries(kcm_krunner_dictionary KF5::Runner KF5::I18n KF5::KCMUtils)

runners/katesessions/CMakeLists.txt

 add_definitions(-DTRANSLATION_DOMAIN=\"plasma_runner_katesessions\")
 
-kcoreaddons_add_plugin(krunner_katesessions SOURCES katesessions.cpp INSTALL_NAMESPACE "kf5/krunner")
+kcoreaddons_add_plugin(krunner_katesessions SOURCES katesessions.cpp INSTALL_NAMESPACE "kf${QT_MAJOR_VERSION}/krunner")
 target_link_libraries(krunner_katesessions KF5::KIOGui KF5::Notifications KF5::I18n KF5::Runner)

runners/konsoleprofiles/CMakeLists.txt

 add_definitions(-DTRANSLATION_DOMAIN="plasma_runner_konsoleprofiles")
 
-kcoreaddons_add_plugin(krunner_konsoleprofiles SOURCES konsoleprofiles.cpp INSTALL_NAMESPACE "kf5/krunner")
+kcoreaddons_add_plugin(krunner_konsoleprofiles SOURCES konsoleprofiles.cpp INSTALL_NAMESPACE "kf${QT_MAJOR_VERSION}/krunner")
 target_link_libraries(krunner_konsoleprofiles
     KF5::Runner
     KF5::KIOGui

runners/spellchecker/CMakeLists.txt

@@ -8,12 +8,12 @@ target_link_libraries(krunner_spellcheck_static
     KF5::SonnetCore
 )
 
-kcoreaddons_add_plugin(krunner_spellcheck SOURCES spellcheck.cpp INSTALL_NAMESPACE "kf5/krunner")
+kcoreaddons_add_plugin(krunner_spellcheck SOURCES spellcheck.cpp INSTALL_NAMESPACE "kf${QT_MAJOR_VERSION}/krunner")
 target_link_libraries(krunner_spellcheck
     krunner_spellcheck_static
 )
 
-kcoreaddons_add_plugin(kcm_krunner_spellcheck INSTALL_NAMESPACE "kf5/krunner/kcms")
+kcoreaddons_add_plugin(kcm_krunner_spellcheck INSTALL_NAMESPACE "kf${QT_MAJOR_VERSION}/krunner/kcms")
 ki18n_wrap_ui(kcm_krunner_spellcheck spellcheck_config.ui)
 target_sources(kcm_krunner_spellcheck PRIVATE spellcheck_config.cpp)
 target_link_libraries(kcm_krunner_spellcheck