[brynet]

What's interesting is that the syscall-compatibility layers in the BSDs began with SunOS binary compat on NetBSD m68k/32-bit sparc-- which was created by Theo de Raadt.

https://marc.info/?l=openbsd-tech&m=161435521906992&w=2

https://github.com/NetBSD/src/commit/6ce3f21

https://github.com/NetBSD/src/commit/1a68594

He also came to the same conclusion compat layers were a dead end (OpenBSD removed all compat_*(8) support, including Linux).