Display installed port dependencies

[Andy Smith]

Hi,

Is there a simple way to display a list of all installed packages
that depend on another given installed package?

i.e. say I would like to know every installed package that depends
on gmake which I also have installed.  Is there any quick way to
display this?

I am aware of portsearch which will allow me to get a nice list of
every port that depends on another port, but as far as I can see
this only operates on the ports collection, not just the ones
installed as packages.

Thanks,
Andy

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