unrar mojave install error

[nhojpatrick (John Patrick)]

Just upgraded to Mojave, reinstalled Ports by following ​https://trac.macports.org/wiki/Migration, also looked at ​https://trac.macports.org/ticket/57245 which additionally talks about doing xcode-select --install and xcodebuild -license which I've done.

I've also got Terminal set to /opt/local/bin/bash -l and when i relaunch I get this;

[Command not found: /opt/local/bin/bash]

[Could not create a new process and open a pseudo-tty.]

This is the error I see;

Error: unrar cannot be installed for the configured universal_archs 'x86_64 i386' because it only supports the arch(s) ''.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.
Error: Processing of port unrar failed