select() system call in the terminfo library

[P.Garbha]

In the Xenix 2.3.1 /lib/386/Slibtinfo.a library the select() system
call is disabled, by including a routine like:

select()
{
	return -1;
}

I find that very strange, since there exist a select() system call
in the kernel (but not in any lib*).
What could ever be the reason to make this dummy routine?
If a program using the select() system call is ported to Xenix,
wouldn't you rather get an "undefined" error message, than a
broken program?