createlang 'pltclu' with postgreSQL.

<p><font face="Verdana" size="2">Hi,</font><p><font face="Verdana" size="2">I have already installed Postgres
8.0.1.</font><br/><font face="Verdana" size="2">I am able to use pl/pgsql language but...I want to use language
'<b>pltclu</b>'with postgreSQL. Its unable to find "pltcl".</font><p><font face="Verdana" size="2">I am getting this
error.</font><p><b><fontcolor="#FF0000" face="Verdana" size="2">$ createlang pltclu testdb</font></b><br /><font
color="#FF0000"face="Verdana" size="2">ERROR:  could not access file "$libdir/pltcl": No such file or
directory</font><br/><font color="#FF0000" face="Verdana" size="2">createlang: language installation failed: ERROR: 
couldnot access file "$libdir/pltcl": No such file or directory</font><p><font face="Verdana" size="2">Where this file
"$libdir/pltcl"can be found????</font><p><font face="Verdana" size="2">I have installed "tk-8.4.9-sol9-sparc-local.gz"
and"tcl-8.4.9-sol9-sparc-local.gz" file using pkgadd -d command.</font><br /><font face="Verdana" size="2">Any othe
configurationrequired????</font><p><font face="Verdana" size="2">Regards<br /> Dinesh Pandey</font><font face="Times
NewRoman"><br /></font>