understanding this portupgrade error

[Michael P. Soulier]

Hi,

I'm upgrading cacti, and it's failing on the net-snmp port. 

===>  Installing for net-snmp-5.3.1_2
===>   net-snmp-5.3.1_2 depends on file: /usr/local/bin/perl5.8.8 - found
===>   Generating temporary packing list
===>  Checking if net-mgmt/net-snmp already installed
===>   An older version of net-mgmt/net-snmp is already installed
(net-snmp-5.2.3_4)
      You may wish to ``make deinstall'' and install this port again
      by ``make reinstall'' to upgrade it properly.
      If you really wish to overwrite the old port of net-mgmt/net-snmp
      without deleting it first, set the variable "FORCE_PKG_REGISTER"
      in your environment or the "make install" command line.
*** Error code 1

I'm confused. Of course an older version is installed, that's why it's called
an upgrade. 

Why is this happening? 

Thanks,
Mike
-- 
Michael P. Soulier <msoulier at digitaltorque.ca>
"Any intelligent fool can make things bigger and more complex... It
takes a touch of genius - and a lot of courage to move in the opposite
direction." --Albert Einstein
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