[
{ type: install
  message: <<EOM
To use Getdelta for upgrading ports you need to add the following string into /etc/make.conf:
FETCH_CMD=%%PREFIX%%/bin/getdelta.sh

To do this you can simply run the following command:
echo "FETCH_CMD=%%PREFIX%%/bin/getdelta.sh" >> /etc/make.conf
EOM
}
]