[opus] arm64 support

[Martin Storsjö]

On Thu, 27 Mar 2014, Vinay Nair wrote:

> I am trying to generate the config and makefiles using ./autogen.sh on the
> mac but get the following error: 
> 
> Can't exec "aclocal": No such file or directory at
> /usr/local/share/autoconf/Autom4te/FileUtils.pm line 326.
> 
> autoreconf: failed to run aclocal: No such file or directory
> 
> 
> How do I build opus from source? Am I missing some step?

Yes, you need to install autotools in order to regenerate the configure 
script.

// Martin