[newbie] replacing applications in the Base set?

[Shadi Abou-Zahra <shadi%abou-zahra.net@localhost>]

Hi folks,

Apologies for the newbie question, I was not able to find help online or 
in the mailing list archives.

Short:
- How does one replace applications pre-installed in the Base set?

Longer:
- I'm trying to update some of the applications in the Base set to the 
latest versions. For instance OpenSSH, Postfix, or others. I installed 
the corresponding packages using pkgsrc and now have two installations 
(in /usr/bin and /usr/pkg/bin or in /usr/sbin and /usr/pkg/sbin). How 
does one get rid of the older versions in /usr/bin and /usr/sbin?

Thanks,
  Shadi

--
Lieber Querschnitt als Durchschnitt
         - Peter Laisacher, Salzburger Rugby Bulls