colout depends on python3, but this is not marked as a dependency

[dave_gomboc@…]

After installing it successfully, attempting to run it gives:

/opt/local/bin/colout: line 11: python3: command not found

Examination of /opt/local/bin/colout shows that it is a shell script whose only job is to invoke python3.

(Expected behaviour would be for the package manager to tell me that this script depends upon python3, and install them both at my option.)