Restricted character set for Github repo names?

[Mathieu Arnold]

+--On 14 juillet 2016 12:37:16 +0100 Ben Lavery <ben.lavery at hashbang0.com>
wrote:
| Thanks Jan,
| 
| For some reason it didn't like the GH_TUPLE - although it didn't
| complain the tar.gz wasn't fetched...
| 
| I renamed the :group as you suggested, make(1) is happy and the
| files are fetched!

To be precise, it is not make(1) that is made happy in this case make(1)
does not care if a variable has an hyphen (or a plus, or many things) it is
sh(1) that cares.

-- 
Mathieu Arnold
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