Peter J. de Vrijer wrote:
>>Is it okay to ignore this message for now?
>
> No, it is not okay. It means that something is wrong with
> /etc/conf.d/hostname

Not necessarily. A warning will be shown if /etc/hostname merely
exists. From /etc/init.d/hostname:

if [[ -f /etc/hostname ]] ; then
ewarn "You should stop using /etc/hostname and use
/etc/conf.d/hostname"