Database Restore Fail - No liblwgeom.so

Hi there

I'm transferring a database from 8.2 to 8.4 and I have some triggers that
reference liblwgeom.so within the database.

When I restore a dump of the 8.2 database into my 8.4 database it says
that liblwgeom.so does not exist. From various forums on the internet I have
discovered that this has been replaced with the file postgis-1.5.so. Does
anyone have any recommendations on how I should proceed? I am really aiming
for the pg_restore to restore everything to the same state as the 8.2
database but seeing these trigger creations are erroring during the
restoration they are not being generated and I want to avoid having to go in
after the restore and generate them myself.

Many thanks in advance.

Rebecca