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From: Tobias Geerinckx-Rice <somebody@not-sent-or-endorsed-by.tobias.gr>
Subject: Re: Disable ugly pc-speaker sound in Slim auth failure
Date: Sat, 16 Mar 2019 17:00:46 +0100
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To: znavko@tutanota.com
Cc: Help Guix <help-guix@gnu.org>

Zvavko,

znavko wrote:
> # guix system reconfigure /etc/config.scm
> /etc/config.scm:97:26: error: comma-separated: unbound variable
> hint: Did you forget a `use-modules' form?

[=E2=80=A6]

> Mentioned github page has no any use-modules string that can=20
> help.

Look again.  From system-config/os-main.scm:

   (al utils)

And indeed, guile/modules/al/utils.scm has:

  (define (comma-separated . strings)
    "Return string by concatenating STRINGS with commas."
    (mapconcat identity strings ","))

You can copy the definition to your own configuration, or just=20
replace it with the (trivial) MAPCONCAT call directly, or just use=20
a comma-separated string to begin with.

Kind regards,

T G-R