Mathieu Lirzin <mthl@gnu.org> writes:

> * gnu/packages/emacs.scm (emacs-emmet-mode): New variable.
> ---
>  gnu/packages/emacs.scm | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
>
> diff --git a/gnu/packages/emacs.scm b/gnu/packages/emacs.scm
> index ce9b1a66a..c9e7739f2 100644
> --- a/gnu/packages/emacs.scm
> +++ b/gnu/packages/emacs.scm
[...]
> +	      (method url-fetch)
> +	      (uri (string-append "https://github.com/smihica/emmet-mode"
> +				  "/archive/v" version ".tar.gz"))
                                            ^^
                                            no 'v' here.

Here is the updated patch.