createlang fails

> createlang plpgsql template1

ERROR:  stat failed on file '$libdir/plpgsql': No such
file or directory
ERROR:  stat failed on file '$libdir/plpgsql': No such
file or directory
createlang: language installation failed

I compiled from source using prefix=/usr. plpgsql.so
is in /usr/lib/postgresql/. I did psql -c 'select
version()' and verified 7.3 is being used. Also tried
setting 'dynamic_library_path' to
'/usr/lib/postgresql' path in postgres.conf. Any help? Thanks.

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