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From: Darren Pilgrim <list_freebsd@bluerosetech.com>
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To: Patrick Dung <patrick_dkt@yahoo.com.hk>
Subject: Re: Discussing ideas or wish list
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On 8/9/2013 9:29 PM, Patrick Dung wrote:
> Yes, I can install lang/perl5.12. But in that case, I can't install
> other perl /p5 pre-build packages (which depends on Perl 5.14)
> provided by FreeBSD, due to dependency problem.

Install them from ports and add the external dependencies from packages. 
  Tools like portmaster even have options to automate this for you.