sql_mode="oracle" errors on DBMS_OUTPUT and subfunctions

This example from Oracle tutorials throws errors:

CREATE OR REPLACE PROCEDURE procPrintHelloWorld

IS

BEGIN

  DBMS_OUTPUT.PUT_LINE('Hello World!');

END;

/

The DBMS_OUTPUT line throws "ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '' at line 4"

https://www.techonthenet.com/oracle/procedures.php

We should provide equivalents for the most used DBMS packages.