This script uses the existing ports infrastructure to track dependencies,
and to keep those dependencies up to date.  Because it is written in /bin/sh,
it needs no other languages installed.

Portmaster has the following features:
  * User can specify the port to upgrade (or install) either by directory
    in /usr/ports, or by directory in /var/db/pkg
  * Updates and repairs (as needed) entries for dependencies in both +CONTENTS
    and +REQUIRED_BY files for both the port that is being updated, and any
    ports that depend on it
  * Runs make config recursively through all ports before starting build
  * Recursively checks and upgrades (or installs) all dependencies
  * User can force upgrades of all dependent ports
  * Runs make clean before starting the build (can be disabled)
  * Offers the user the opportunity to delete stale distfiles
  * Supports /usr/ports/MOVED
  * Supports non-default settings of PORTSDIR and PKG_DBDIR
  * Interactive update mode (prompts for each update)
  * Option to rebuild port, and ports that depend on it
  * Options to make packages out of installed, and new ports
  * Option to clean out stale port dependencies
  * Downloads distfiles in the background

WWW: http://dougbarton.us/portmaster.html