Cannot build "xcrun"

[Dave Horsfall]

[ I usually post as "d...@horsfall.org" but I'm having problems with
Optusnet ]

High Sierra 10.13.6 on MacBook Pro (13-inch, Mid 2010).

Trying to build "gnuplot" it sees "aquaterm" as a dependancy and fails when
trying to build "xcrun" with ":info:build xcrun: error: unable to exec
Xcode native xcrun (Permission denied)."

The main.log file is attached (and some of those warnings look a bit suss
to me).

Yes, I ran "port clean all" first.

Where have I stuffed up?

Thanks.

-- Dave

main.log
Description: Binary data