XV/GIMP/etc: Can't open display

[Uli Wienands]

Maybe setting the DISPLAY is the issue. On my machine, DISPLAY in a new 
terminal session is

/private/tmp/com.apple.launchd.vW9b4Z3lh5/org.macosforge.xquartz:0

and presumably this is the mechanism by which Xquartz is triggered to 
launch when a process in Terminal accesses DISPLAY.

Uli

On 1/28/22 3:34 PM, Dave Horsfall wrote:
> MacBook Pro (13-inch, Mid 2010), saddled with High Sierra 10.13.6 (as far
> as it will go).
>
> Back when I was running Sierra these tools worked just fine; after
> upgrading to HS (and rebuilding MacPorts that took almost a day) things
> went pear-shaped:
>
>      mackie:~ dave$ xv
>      xv: Can't open display
>      mackie:~ dave$ gimp
>      Cannot open display:
>      mackie:~ dave$ echo $DISPLAY
>
>      mackie:~ dave$
>
> Is this something I forgot to do during the upgrade?  I set $DISPLAY to
> ":0" (an old Unix trick) to no effect, so I guess it's using a named pipe
> instead but I cannot find it; poking around doesn't seem to uncover
> anything applicable to this, and I certainly won't trust any "advice" on
> StackOverflow.
>
> Where has my 70yo brain screwed up?
>
> Thanks.
>
> -- Dave