>>>>> How can a user 'su' without knowing the root password?
>>>>
>>>> sudo (see /pkgsrc/security/sudo) implements this if you like to; you
>>>> have to enable this using 'visudo' (thus editing sudo's config 
>>>> file):
>>>> [...]
>>>
>>> No need for this; see su(1):
>>>
>>> COMPILATION OPTIONS
>>>      Several compilation time options are available that alter the
>>> [...]
>>
>> thanks, that's true -- but requires recompilation of su(1).
>
> So does your suggestion above (looking at pkgsrc); in addition, the 
> original
> question was pertaining su(1).

i guess installing a package from pkgsrc is more convenient (esp. for 
not-developers, i.e. people w/o NetBSD src on their machines) than 
downloading src, reconfigure, compile etc. etc.

fortunately it's up to the user :)

timo