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Date: Mon, 16 Mar 2009 07:54:36 -0500
From: Stephen Montgomery-Smith <stephen@math.missouri.edu>
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To: Alex Povolotsky <tarkhil@webmail.sub.ru>
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Cc: freebsd-ports@freebsd.org
Subject: Re: Conditionals in pkg-plist
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Alex Povolotsky wrote:
> Hello!
> 
> How do I implement conditional in pkg-plist?
> 
> if WITH_STARTTLS is defined, %%PORTDOCS%%%%DOCSDIR%%/README.STARTTLS 
> should be added to package list.
> 
> I haven't found approporate instructions in porter's handbook.
> 
> Alex.


You want to use PLIST_SUB where a variable optionally gets the value 
"@comment ".

There are many examples in the ports.  For example, math/oleo - see how 
it handles the NLS option.

(A paragraph about this would make a good addition to 
http://www.freebsd.org/doc/en/books/porters-handbook/plist.html#PLIST-SUB).