> and make in that directory dies with
> 
>   cc   -o /usr/src/usr.bin/man/man config.o man.o 
>   /usr/bin/ld: cannot open output file /usr/src/usr.bin/man/man: Is a
> directory
>
>   collect2: ld returned 1 exit status
>   *** Error code 1

I think the problem is related to cvs.  When you update your source
tree you need to run 'cvs update -d -P' - the -P prunes empty
directories (which get in the way sometimes).

Hope this helps!

Mike.