version and debug statements

[Walter Bright]

Sean Kelly wrote:
> I think technically, the "Unix" moniker refers to the two derivatives of 
> the code originally developed at Bell Labs: BSD Unix, and AT&T Unix. The 
> other versions are Posix compliant, but not actually "Unix."

That is one of my problems with "Unix" - nobody knows what it means. 
Such confusion will inevitably creep into code which multiple people 
will be maintaining. Posix makes more sense, because it is a defined 
standard.