aubio: added HEAD source

Oh right. No, the “./waf configure” part automatically detects what’s available, via pkg-config I believe.

> On 6 Nov 2014, at 17:05, Dominyk Tiller <notifications@github.com> wrote:
> 
> In Library/Formula/aubio.rb:
> 
> > @@ -20,6 +22,12 @@ class Aubio < Formula
> >    depends_on 'pkg-config' => :build
> >    depends_on :libtool => :build
> >  
> > +  depends_on 'libav' => :optional
> > +  depends_on 'libsndfile' => :optional
> > +  depends_on 'libsamplerate' => :optional
> > +  depends_on 'fftw' => :optional
> > +  depends_on 'jack' => :optional
> ie, Do they need to be pointed at with ./configure, such as ./configure --with-jack=/dir/to/jack --with-libav=/dir/to/libav etc.
> 
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