Problem enabling pltcl

I have configured, built, and installed ProsgreSQL 6.5.1 using:

    --with-tcl and --with-tkconfig=<dir>

As far as I have looked, everything was built and installed without a
hitch. The pltcl library is in the right location, and /etc/ld.so.conf
lists that directory.

When I define a function using pltcl I get the following:

    ERROR: Unrecognized language specified in a CREATE FUNCTION:
    'pltcl'.  Recognized languages are sql, C, internal and the
    created procedural languages.

The docs say that pltcl is enabled if it is built with the TCL
option. What am I missing?

Thanks
-- 
Patrick Logan    patrickdlogan@home.com