DBMS_PIPE in Oracle 7.3

I'm trying to use the DBMS_PIPE package in stored procedures in Oracle 7.3 running on HP-UX 10.01. If I enter the following at the SQL*Plus prompt, I get valid output with no errors:

   EXECUTE DBMS_Output.Put_Line( DBMS_PIPE.Unique_Session_Name );

But, the following line in a stored procedure gives me a PLS-00201 error, indicating that SYS.DBMS_PIPE is not defined:

   pipe_name := DBMS_PIPE.Unique_Session_Name;

As a matter of fact, every line that references one of the DBMS_PIPE functions gives me the "undefined object" error message.

Any ideas as to what could be going wrong?

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