make buildworld crash, unwind.h

[Justin C. Sherrill]

On Thu, December 7, 2006 3:39 pm, Peter Avalos wrote:

>> When is cvsup appropriate vs. cvs?  Using cvsup is what we have
>> documented.
>>
>
> It appears that he is using cvsup to get the repo, and usung cvs to update
> his src/ tree.

Should we be describing that in documentation?  I see both techniques in
use, but I haven't seen a reason one should be described over the other. 
(I always just used cvsup.)