Upgrade 6.1 to 7.1 remotely?

[Adam Vande More]

Robert Fitzpatrick wrote:
> I have a remote system with no access to boot info. I can get someone to
> reset, look at screen, etc. The server is 6.1-RELEASE-p15 and wondering
> if there is a path to upgrade to 7.1 remotely. Would it be possible to
> do something like this for getting the box to 6.4...
>
> http://www.daemonology.net/blog/2006-11-26-freebsd-6.1-to-6.2-binary-upgrade.html
>
> And then another freebsd-update to 7.1? Seems that box will not let me
> portupgrade clamav anymore due to a change from 6.1 :(
>
> ../libclamav/.libs/libclamav.so: undefined reference to `gethostbyname_r'
> *** Error code 1
>
>   
http://www.daemonology.net/blog/2007-11-11-freebsd-major-version-upgrade.html