From mboxrd@z Thu Jan  1 00:00:00 1970
From: Leo Famulari <leo@famulari.name>
Subject: Re: mutt builds to fail on a barebones sytem
Date: Thu, 14 Jul 2016 18:21:53 -0400
Message-ID: <20160714222153.GA12289@jasmine>
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To: Carlos =?iso-8859-1?Q?S=E1nchez?= de La Lama <csanchezdll@gmail.com>
Cc: guix-devel@gnu.org

On Thu, Jul 14, 2016 at 05:14:19PM +0200, Carlos Sánchez de La Lama wrote:
> Hi all,
> 
> in my new system (almost identical to the barebones template), mutt does
> not build:
> 
> --8<---------------cut here---------------start------------->8---
> $ guix package -i mutt
> 
> ...
> 
> chgrp: invalid group: ‘mail’
> Can't fix mutt_dotlock's permissions!  This is required to lockmailboxes in the mail spool directory.
> Makefile:1337: recipe for target 'install-exec-hook' failed
> --8<---------------cut here---------------end--------------->8---

Strange, it works for me on GuixSD (where I don't have a 'mail' group)
and also with Guix on Debian.

Can you give some more information about your setup?