Ludovic Courtès writes:

> If it’s possible to avoid the whole list using ‘find-files’ or
> ‘scandir’, that would be nicer IMO.  If it’s not, that’s fine.

In the attached patch I used `find-files' instead.  The expression is a
bit long, but I think it's still clear enough to be preferable to the
long list.

>> +    (license license:gpl3)))
>
> GPLv3-only?

You were right: it's GPLv3+.  My apologies.