[REG 4.1 -> 4.2] Warning for kits created with Creator 4.1

1. In Creator 4.1, configure a kit with a Qt version.
2. Quit Creator 4.1.
3. In Creator 4.2, go to "Tools" -> "Options..." -> "Build & Run" -> "Kits".
   Creator displays a warning for the kit from step 1, reading: "CMake configuration has no CMAKE_PREFIX_PATH set that points to the kit Qt version."

Does it need one? It didn't seem to need it in Creator 4.1. Could Creator 4.2 use whatever Creator 4.1 used?