New port for ruby-dbi with odbc support

There's two port files, rb-dbd-pg and db-dbd-mysql that currently just extend rb-dbi with a few configure args. They should probably use variants, but I digress. I've created another Portfile, in the spirit of these two, so you can install ruby-dbi with odbc support via macports, just like you can with mysql or postgres. It's a dead- simple Portfile. How can I get this added to the ports tree? (feel free to point me to an FAQ... the macports site+docos are excruciating, have spent ages looking already) -- tim