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NSTask, environment and ... X11

Hello there
I was wondering why this piece of code doesn't work by itself on my mac ?

NSTask *task;
task = [[NSTask alloc] init];
[task setLaunchPath: @"/bin/bash"];

NSDictionary * environment = [NSDictionary dictionaryWithObjectsAndKeys:@"localhost:0.0",@"DISPLAY",nil];
NSArray * arguments = [NSArray arrayWithObjects: @"-c", @"/usr/ X11R6/bin/xhost + && /sw/bin/nedit", nil];
[task setEnvironment: environment];
[task setArguments: arguments];
[task launch];

It usually throws some error like this:

Xlib: connection to "localhost:0.0" refused by server
Xlib: No protocol specified

/usr/X11R6/bin/xhost:  unable to open display "localhost:0.0"

Anyway, a simple xhost + as root can solve the problem.

BUT ... it's weird !

I mean, I should be able to do the xhost + as the user to allow connection on the local machine don't you think?
So, does anyone knows how to deal with this problem without having to authenticate ?

Best regards,
Thierry.
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