There is no Qt "runtime". Qt is just a library.

> Native means system libraries only.

Every non-trivial application will eventually use third-party non-system libraries.

I think "Native app development" has at least two meanings:

1. narrow meaning: the program uses a native UI toolkit (Win32, Cocoa)

2. broad meaning: the program targets one or more specific platforms and the UI is not not just a webview

Even with the narrow meaning, WxWidgets would qualify as "native development" (because it uses native UI toolkits under the hood), yet it is still a third-party library.