How to construct this port?

[Nils Vogels]

Hi !

I'm trying to set up a new port, but I'm unsure how to proceed, until
now I've only maintained already existing ports.

The port is a plugin for an already existing port, giving extra
functionality, but is maintained as a seperate package.

In order to compile the port, you need a sourcetree of both the original
port and the port of the plugin, where the sourcetree of the original
port has to have been ./configure-d

How would I go about this?

Greetings,

Nils