X11 app - unable to open display ""

[Christoph Kukulies]

I installed the „gv“ port (ghostview). Worked.  I can give gv on the command line (shell prompt).
But I’m getting:

Christophs-MBP:~ kuku$ export DISPLAY=:0
Christophs-MBP:~ kuku$ xhost +
xhost:  unable to open display ":0"
Christophs-MBP:~ kuku$ gv
gv: Unable to open the display.
Christophs-MBP:~ kuku$ 

I thought, X11 apps can run against the macOS desktop server, can’t they?
Or do I have to run an extra X11-server?

—
Christoph


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