droplang doesn't completely work?

In 7.2.1

For database x:
1) On primary sytem:
pg_dump -f x.pgdmp -Fc x
2) On a bkuphost system that has 7.2.2:
createdb -T template0 x
pg_restore -U xuser -h bkuphost -p 5432 -d x -Fc x.pgdmp

get error:
pg_restore: [archiver (db)] could not execute query: ERROR:
stat failed on file '/usr/local/pgsql-7.2/lib/plpgsql': No such file or
directory

So, I go back to primary system and
droplang -d x plperl

I do 1) and 2) again. Same ERROR.

So, I go back to primary system again, and for database x:
select proname, probin from pg_proc

and see:
...
plperl_call_handler | $libdir/plperl
...

Shouldn't this be gone after I droplang?

I know that if I never did a createlang plperl in a database it is not
there...so why does it stay? Is this what is still causing the error on
the pg_restore? Bug? Work around is to drop this record from the pg_proc
table?

Thanks,

--
Laurette Cisneros
The Database Group
(510) 420-3137
NextBus Information Systems, Inc.
www.nextbus.com
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