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Working behind a firewall/through a proxy
Building apps from the Ports Collection is easy if you're on the Internet -- it'll simply ftp down the files from the web. However, if you're behind a firewall, this may not work. To set up to make a port by fetching the files through a proxy, merely set the environment variable HTTP_PROXY=<proxy-name-or-ip-addr>:<proxy-port-number>, eg.

setenv HTTP_PROXY=proxy.domain.com:80