[opus] [libopusfile PATCH] build: implement autotools build system for libopusfile.

[Gregory Maxwell]

On Tue, Sep 25, 2012 at 12:49 AM, Timothy B. Terriberry
<tterribe at xiph.org> wrote:
> The default CFLAGS should include
> -std=c89 -pedantic -Wextra -Wno-parentheses -Wno-long-long -Wall
>
> They should also include -fvisibility=hidden.

These need to be guarded with tests, since they'll make some non-gcc
(and older GCC) compilers croak.

(See the libopus setup for an assuredly crappy example)