Hi Rick,
I installed XQuartz and R with the default location suggested during the installation process. I don't know exactly why it cannot be found via the Terminal. Please find below the output from the ls -ld /opt/X11/lib/libXp.* command.
bash-3.2$ ls -ld /opt/X11/lib/libXp.*
ls: /opt/X11/lib/libXp.*: No such file or directory
Out of curiosity, would it be recommended to update the version of bash that I have currently? I could read that the bash version installed by default on macOS is somehow outdated.
Many thanks!
Claudie
Claudie