openbox doesn't depend on xorg-server because x11 is network transparent 
and wayland not.
Install xorg or xorg-minimal to have a local xserver.

Am Dienstag, 30. Juni 2015 00:07:38 UTC+2 schrieb amber gold:
>
> Yes, I know that I just type 'startx' to enter graphical mode, but in my 
> case there is no 'startx' command. Installing Openbox didn't trigger X11 
> but Wayland. And that's why I posted this issue here. 
>
> On Monday, June 29, 2015 at 10:43:34 PM UTC+2, Antonio Malcolm wrote:
>>
>> Huh. I hadn't noticed this. I mean, I know Wayland is installed, but 
>> running Openbox with lightdm, my X session starts just fine.
>> What packages did you install before attempting to start your session?
>> BTW, startx starts X.
>>
>