list ports that depend on a given port

[Christopher Jones]

> 
> This exact question came up on IRC a while back. IIRC the query is interpreted as a regular expression. So in order to get matches for only dependents that begin with “boost” you could try
> 
> port echo depends '^boost'
> 
> (I’m not at my computer ATM so I can’t test this to verify.)
> 
> Greg

Thats for the suggestion, I had a similar thought but cannot seem to get that to work, e.g.

Oberon ~/Projects/MacPorts/ports > port echo depends:'^boost'
Oberon ~/Projects/MacPorts/ports > 

it matches nothing

Chris

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