Matthew Lien <bluet@bluet.org> skribis:

> 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;
>           ^

Could you try changing lines 174 and 177 like this: