On 2022-01-28 at 16:34:29 UTC-0500 (Sat, 29 Jan 2022 08:34:29 +1100 (EST))
Dave Horsfall <d...@horsfall.org>
is rumored to have said:

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?

Did you reinstall the X server? I believe that you need to. Specifically the xorg-server and xinit ports.

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.

Properly installed, it Just Works. At least after a logout/login cycle.

If it is correct, you will have a DISPLAY of the form:

/private/tmp/com.apple.launchd.<RANDOMCHARS>/org.macports:0

To get that, you need the xinit port.

--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire

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