PLS-00201: identifier 'DBMS_LOCK' must be declared while compile object

Error while compile object:

SQL> alter PROCEDURE OBIEE.SDLEARNING compile;

Warning: Procedure altered with compilation errors.

Check error details:

SQL> show error

Errors for PROCEDURE OBIEE.SDLEARNING:

LINE/COL ERROR

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62/7 PL/SQL: Statement ignored

62/7 PLS-00201: identifier 'DBMS_LOCK' must be declared

Error due to permission issue , grant execute on dbms_lock to user and retry compile and it works 

SQL> GRANT execute ON DBMS_LOCK TO OBIEE;

Grant succeeded.

SQL> alter PROCEDURE OBIEE.SDLEARNING compile;

Procedure altered.