Where's kf5_add_ui_files ?

[Albert Astals Cid]

tier2/ki18n/Mainpage.dox says
 * If CMake is used as the build system, a macro that performs
 * all of the above is provided (\c kf5_add_ui_files).

But I can't seem to use it at all in my CMakeLists.txt.

Any pointers?

Cheers,
  Albert