[GENERAL] CREATE EXTENSION does not seem to work in 9.2

[Susan Cassidy]

When I tried to do CREATE EXTENSION IF NOT EXISTS
/usr/pgsql-9.2/share/extension/plpgsql.control with schema public;

it gave me
ERROR:  syntax error at or near "EXTENSION"

CREATE LANGUAGE worked just fine.  I only tried CREATE EXTENSION because
the manual said that CREATE LANGUAGE was deprecated.

Susan