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Because it is wrong, they are not build on Linux. The roots go back to a BSD, so it's a Unix.

Yes, correct... There are falv of Unix too - http://www.linfo.org/flavors.html

Right, it is considered to be a flavor of Unix. But OS X has nothing to do with Linux other than a common ancestor.

Linux is not an ancestor of any flavor of Unix. It did not evolve from a Unix codebase.

It is the epitome of a "Unix-like" operating system. At an early point, it might've been fair to call it a spiritual successor of Minix, though.

> Linux is not an ancestor of any flavor of Unix.

I don't think I suggested that it was.