Problem with PL/pgSQL

What is wrong with the following function?

CREATE FUNCTION logfunc2 (text) RETURNS int AS '
        DECLARE
                text ALIAS FOR $1;
        BEGIN
                SELECT length(text);
                RETURN ''3'';
        END;
' LANGUAGE 'plpgsql';

I get the following error:

ERROR:  Unrecognized language specified in a CREATE FUNCTION: 'plpgsql'.

        Recognized languages are sql, C, internal, and created
procedural languages.


According to my docs "plpgsql" should be ok.

    Hans