[bug#51085] [PATCH v2 6/7] gnu: Add mp3guessenc.

[Leo Famulari]

Thanks for these patches! I've hoped for a Mixxx Guix package for a long
time.

The patches look good to me overall, but I have a couple questions:

On Sat, Oct 09, 2021 at 03:28:19PM +0000, Vinicius Monego wrote:
> * gnu/packages/audio.scm (mp3guessenc): New variable.

> +       (list (string-append "PREFIX=" (assoc-ref %outputs "out"))
> +             (string-append "SUFFIX="))

What is SUFFIX? That string doesn't appear in the mp3guessenc source
code.