sysdeps/posix is appropriate because it's implemented in terms of POSIX interfaces.
It's bad to lose any functionality, though __UL_GETMAXBRK actually being used seems a bit unlikely. But it's easy enough to add it. So I'd do: First commit: move file verbatim to sysdeps/posix/. Second commit: add __UL_GETMAXBRK to that implementation. Third commit: remove sysdeps/unix/bsd/ file. Thanks, Roland
