How to fix the problem of "Cannot open display"?

[Peng Yu]

On Tue, Oct 6, 2009 at 3:15 AM, Rainer Müller <raimue at macports.org> wrote:
> On 2009-10-06 04:26 , Joshua Root wrote:
>> On 2009-10-6 11:19, Ryan Schmidt wrote:
>>> So the instructions the port prints out are wrong? Is there a way to
>>> correct them? It sounds like you're saying you need "sudo" to have
>>> access to write the changes to the plist, but I remember from prior
>>> discussions that this would cause the launchagent to be running as root,
>>> when in fact we want the launchagent running as the current user.
>
> You are right, LaunchAgents/org.freedesktop.dbus-session.plist is meant
> to be run by the current user, not root.
>
> And yes, the instructions look kind of wrong. launchctl load -w without
> sudo does not work because it requires write access to the file. But if
> -w is not used, the Disabled key will not be removed and it cannot be
> loaded automatically at system startup time...
>
>> The bottom line is that the startupitem code needs some love. At present
>> it really can't handle anything beyond launchdaemons that will be
>> started by root.
>
> dbus does not use the startupitem.* code for
> org.freedesktop.dbus-sesstion.plist as it installs multiple plist files
> which startupitem.* cannot handle.

I don't understand what would be the solution to my problem. Could
somebody let me know the detailed steps what I should do?

Regards,
Peng