From mboxrd@z Thu Jan  1 00:00:00 1970
From: Cyril Roelandt <tipecaml@gmail.com>
Subject: Re: FTBFS on GNU/Hurd
Date: Tue, 02 Jul 2013 20:53:20 +0200
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Hello!

First of all, thanks for trying Guix on GNU/Hurd! There is no bug 
tracking system, just this mailing list.

On 07/02/2013 05:06 PM, Matthew Lien wrote:
> nix/nix-daemon/guix-daemon.cc: In function ‘error_t parse_opt(int, char*, argp_state*)’:
> nix/nix-daemon/guix-daemon.cc:174:14: error: invalid conversion from ‘int’ to ‘error_t {aka __error_t_codes}’ [-fpermissive]
>         return ARGP_ERR_UNKNOWN;
>                ^
> nix/nix-daemon/guix-daemon.cc:177:10: error: invalid conversion from ‘int’ to ‘error_t {aka __error_t_codes}’ [-fpermissive]
>     return 0;
>            ^

In /usr/include/errno.h:

/* The Hurd <bits/errno.h> defines `error_t' as an enumerated type so
    that printing `error_t' values in the debugger shows the names.  We
    might need this definition sometimes even if this file was included
    before.  */

Which explains your issue. I think this is more of a Nix or GNU bug. 
According to the GNU documentation 
(http://www.gnu.org/software/libc/manual/html_node/Argp-Parser-Functions.html#Argp-Parser-Functions), 
the parse_opt function is fine. Should we ask the Hurd people how they 
handle this ?

Cyril Roelandt.