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Date:      Tue, 3 Jan 2012 20:18:12 -0800
From:      Jason Helfman <jgh@FreeBSD.org>
To:        Paul Schmehl <pschmehl_lists@tx.rr.com>
Cc:        ohauer@freebsd.org, freebsd-ports@FreeBSD.org
Subject:   Re: How to detect the version of a installed perl module during portbuild
Message-ID:  <20120104041811.GA77025@dormouse.experts-exchange.com>
In-Reply-To: <CE503C49DD251ECD02D0F7E1@utd71538.utdallas.edu>
References:  <4F036A7F.1000908@FreeBSD.org> <CE503C49DD251ECD02D0F7E1@utd71538.utdallas.edu>

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On Tue, Jan 03, 2012 at 05:41:01PM -0600, Paul Schmehl thus spake:
>--On January 3, 2012 9:52:15 PM +0100 Olli Hauer <ohauer@FreeBSD.org> wrote:
>
>> Hi,
>>
>> I'm searching a solution to detect the version of p5-JSON-RPC during
>> build time.
>>
>> JSON-RPC-1.01 is *not* backward compatible to 0.96 so I have to apply a
>> fix to the port only if JSON-RPC > 0.96 is installed.
>>
>>
>>> From http://cpansearch.perl.org/src/DMAKI/JSON-RPC-1.01/Changes
>> 1.00_01  2011 Nov 16
>>     - If you are using old JSON::RPC code (up to 0.96), DO NOT EXPECT
>>       YOUR CODE TO WORK. THIS VERSION IS BACKWARDS *INCOMPATIBLE*
>> ...................................................^^^^^^^^^^^^^^
>>
>
>This returns the installed package:
>
>pkg_info -qa | grep "p5-JSON-RPC" | sort | uniq
>
>so maybe you could do something like?
>
>JSON_VER=`pkg_info -qa | grep "p5-JSON-RPC" | sort | uniq | cut -d'-' -f4`
>
>.if ${JSON_VER} >= 1
>  do this
>.else
>  do this
>.endif
>

This may be more clean:

$ perl -MJSON::RPC -le 'print $JSON::RPC::VERSION'
1.01

- -jgh

- -- 
Jason Helfman         | FreeBSD Committer
jgh@FreeBSD.org       | http://people.freebsd.org/~jgh
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