Why did they need to accept any of that? They were doing a clean-room implementation, and mostly ANSI C-compatible with a significantly simplified preprocessor.

Why did they need to accept any of that? They were doing a clean-room implementation, and mostly ANSI C-compatible with a significantly simplified preprocessor. Theo de Raadt considered using it for OpenBSD at the turn of the 21st century, but backed out over licensing. I have no idea what angle you're getting at here.