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From: Lowell Gilbert <freebsd-ports-local@be-well.ilk.org>
To: Big Lebowski <spankthespam@gmail.com>
Subject: Re: Best way to make the port install another port
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Date: Tue, 12 Nov 2013 15:52:11 -0500
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 (Big Lebowski's message of "Tue, 12 Nov 2013 18:58:45 +0000")
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Big Lebowski <spankthespam@gmail.com> writes:

> On Sun, Nov 10, 2013 at 6:02 PM, Big Lebowski <spankthespam@gmail.com>wrote:
>
>> Hi,
>>
>> I wanted to add an option to one of my ports to optionally install
>> commandline tool, that's in another port. Doing the options part is easy
>> and clear, but how should I add that port to build procedure to do it the
>> right-way? The most obvious way would be to add RUN_DEPENDS+=, but the
>> original port doesnt really depend on this tools...
>>
>> Another question is to where is the best place to put such dependency?
>> Post install, pre install?
>>
>> Thanks in advance!
>>
>
> Just bumping it in a hope of someone actually knowing the answer...

Yes, it's RUN_DEPENDS. 

See the OPTIONS example in the porter's handbook for a case.