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Mac OS has "Private Frameworks" - shared libraries that are used by the system but don't ship with headers by default. It's trivial to produce these headers from the libraries, and then make wrappers for them like OpenMultitouchSupport which is a wrapper for MultitouchSupport.framework.

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But just to note, I believe you can't pass Gatekeeper/Notary if you use these APIs so it's not possible to sign the app

Notarisation is not supposed to check for things like this; but you certainly would not be able to ship this to the App Store.

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