libc dependency

[Moritz Maxeiner via Digitalmars-d-learn]

On Monday, 19 June 2017 at 21:35:56 UTC, Steven Schveighoffer 
wrote:
> IIRC, Tango did not depend on libc at all. It only used system 
> calls. So it certainly is possible.

How did they invoke those system calls? They are usually access 
via libc on POSIX systems, so you don't have to implement 
accessing e.g. vdso on Linux yourself.