pkg_version shows duplicate entries, may I deinstall old ones ?

[Chiang Seng Chang]

Hi,

I ran pkg_version and got this:

    autoconf
    autoconf
    docbook
    docbook
    docbook
    docbook
    docbook
    docbook
    libtool
    libtool

This is with -v:

    autoconf-2.13.000227_5
    autoconf-2.53_1
    docbook-1.3
    docbook-241_2
    docbook-3.0_2
    docbook-3.1_2
    docbook-4.0_2
    docbook-4.1_2
    libtool-1.3.5_2
    libtool-1.4.3_3

1. why are there multiple versions of the same "thing" ?
2. is it safe to pkg_deinstall the "older" ones ?
3. since I am using portupgrade, pkg_deinstall should be used instead of pkg_delete, right ?

Regards,

-cs