how to query the dependency graph

[Phil Oertel]

I'm installing gimp and I see gnome-keyring getting installed, and I say
"wtf?" Is there a simple way to find out why? My original interest in
actually finding out why is somewhat superseded now by my new interest in
how to query the ports dependency graph. I'm hoping there's a simple graph
query tool, ideally built into the port tool itself (so's I don't have to
install it), and I don't have to use a graph visualization tool.

Thanks,
Phil
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