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You failed to read this sentence until the end,

> UNIX/POSIX is for all practical purposes the runtime most C applications rely on, there are naturally some exceptions like free-standing or Windows (which eventually gave up and add to start improving its support).

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Point is that C isn't tied to POSIX. It's just not. Of course there are apps created on e.g. Linux, those sometimes get ported by relying on standardized "POSIX" platform. But that's not how you have to program, and it isn't a great way to program. And it isn't a sufficient platform to do anything useful.

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