$ port select --list gcc
Warning: port definitions are more than two weeks old, consider updating them by running 'port selfupdate'.
Available versions for gcc:
mp-gcc8 (active)
none
$ sudo port select --set gcc none
Password:
Warning: port definitions are more than two weeks old, consider updating them by running 'port selfupdate'.
Selecting 'none' for 'gcc' succeeded. 'none' is now active.
Issue
Solution