the problem of createlang! - Mailing list pgsql-sql

I have installed postgresql (version 7.4.5) on the Redhat linux platform.

Now I want to create a database with name BBMF and create pl/pgsql procedure language to the BBMF

The problem is listed follow:

[postgres@wap1-np postgresql-7.4.5]$ psql -l

        List of databases

 Database  |  Owner   | Encoding 

-----------+----------+-----------

 BBMF      | develop  | SQL_ASCII

 template0 | postgres | SQL_ASCII

 template1 | postgres | SQL_ASCII

(3 rows)

[postgres@wap1-np postgresql-7.4.5]$ createlang plpgsql BBMF

ERROR:  Load of file /usr/local/pgsql/lib/plpgsql.so failed: /usr/local/pgsql/lib/plpgsql.so: undefined symbol: error_context_stack

createlang: language installation failed

[postgres@wap1-np postgresql-7.4.5]$ file /usr/local/pgsql/lib/plpgsql.so

/usr/local/pgsql/lib/plpgsql.so: ELF 32-bit LSB shared object, Intel 80386, version 1, not stripped

[postgres@wap1-np postgresql-7.4.5]$

What’s the matter ?

Please help me!!!