[opus] attributes.m4 license

[Diego Elio Pettenò]

Hi Ralph,

On 22/03/2013 17:43, Ralph Giles wrote:
> I noticed yesterday that your attributes.m4 autoconf macro package, part
> of the autotools build support you contributed to opusfile, is licensed
> GPL, rather than the usual blanket grant for macros.

It's actually GPL-plus-exception, which is the same license as autoconf
itself.

> Are you willing to relicense this so it's compatible with the project's
> overall BSD license?

Part of the code was actually derived from already GPL-plus-exception
which is why the license carried over, otherwise I'd be fine with a
simplified BSD license.

HTH,
-- 
Diego Elio Pettenò — Flameeyes
flameeyes at flameeyes.eu — http://blog.flameeyes.eu/