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From: Zhang Weiwu <weiwuzhang@hotmail.com>
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Subject: simple&silly wish to know port dependency.
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Hello. When I make deinstall a port I often get the message:
port xxx depends on this port, but I'll still deinstall it anyway.

That's really frustrating. I'd like to be able to know who depends on it 
before de-installing it. Any suggestions?

Look through the handbook I didn't find an answer.