[bug#43343] [PATCH] gnu: Add cxxopts.

[Mathieu Othacehe]

Hello Greg,

> +              (uri (string-append 
> "https://github.com/jarro2783/cxxopts/archive";
> +                                  "/v" version ".tar.gz"))

Sorry for the delay. Could you use git-fetch method instead and send an
updated version?

Thanks,

Mathieu