Use qt_ macro + Qt::

src/CMakeLists.txt

@@ -48,9 +48,9 @@ set(keditbookmarks_SRCS
    keditbookmarks.qrc
 )
 set(toplevel_xml ${CMAKE_CURRENT_BINARY_DIR}/org.kde.keditbookmarks.xml)
-qt5_generate_dbus_interface( ${CMAKE_CURRENT_SOURCE_DIR}/toplevel.h org.kde.keditbookmarks.xml )
+qt_generate_dbus_interface( ${CMAKE_CURRENT_SOURCE_DIR}/toplevel.h org.kde.keditbookmarks.xml )
 
-qt5_add_dbus_interface( keditbookmarks_SRCS ${toplevel_xml} toplevel_interface )
+qt_add_dbus_interface( keditbookmarks_SRCS ${toplevel_xml} toplevel_interface )
 
 kconfig_add_kcfg_files(keditbookmarks_SRCS settings.kcfgc )
 

src/kbookmarkmodel/CMakeLists.txt

@@ -13,7 +13,7 @@ set(kbookmarkmodel_SRCS
 add_library(kbookmarkmodel_private SHARED ${kbookmarkmodel_SRCS})
 target_link_libraries(kbookmarkmodel_private
 PUBLIC
-   Qt5::Widgets
+   Qt::Widgets
    KF5::XmlGui # KActionCollection
 PRIVATE
    KF5::Bookmarks

src/kbookmarkmodel/tests/CMakeLists.txt

@@ -7,5 +7,5 @@ set( EXECUTABLE_OUTPUT_PATH ${CMAKE_CURRENT_BINARY_DIR} )
 set(kbookmarkmodeltest_SRCS kbookmarkmodeltest.cpp)
 ecm_add_test(${kbookmarkmodeltest_SRCS}
     TEST_NAME kbookmarkmodeltest
-    LINK_LIBRARIES kbookmarkmodel_private KF5::Bookmarks Qt5::Test
+    LINK_LIBRARIES kbookmarkmodel_private KF5::Bookmarks Qt::Test
 )