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Doesn't Android borrow a lot of code from NetBSD and OpenBSD?

Not significantly. Some parts of Bionic (Android's libc equivalent) is based on BSD equivalents, but most of userland is Android-specific.

Android has a few hundred unmodified OpenBSD files.

A few hundred files is very little in a project the size of Android. :)

> but most of userland is Android-specific.

Meaning Java, which makes POSIX irrelevant.