SQLPlus installs with errors on startup (APPINFO)

On Solaris 2.5.1, Oracle 7.3.2, sqlplus installs with the following error(s) on startup. Any help greatly appreciated.

-Lane Sharman
lane_at_bienlogic.com

$ sqlplus

SQL*Plus: Release 3.3.2.0.0 - Production on Sat May 24 00:27:23 1997

Copyright (c) Oracle Corporation 1979, 1994. All rights reserved.

Enter user-name: system
Enter password:
ERROR:
ORA-00900: invalid SQL statement

Error accessing package DBMS_APPLICATION_INFO ERROR:
ORA-00900: invalid SQL statement

Error accessing package DBMS_APPLICATION_INFO You may need to install the Oracle Procedural option SET APPINFO requires Oracle Server Release 7.2 or later

Connected to:
Oracle7 Server Release 7.3.2.1.0 - Production Release Received on Sat May 24 1997 - 00:00:00 CDT