From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gustavo Zacarias <gustavo@zacarias.com.ar>
Date: Mon, 21 Jan 2013 19:48:28 -0300
Subject: [Buildroot] [PATCH 03/10] audiofile: add license information
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On 01/21/2013 07:46 PM, Peter Korsgaard wrote:
> It's (L)GPLv2+:
> 
> grep -rls 'later version' *|wc -l
> 118
> 
> Committed with that change, thanks.

That's for the library component, the tools however are GPL.
See README.
Regards.