Ingo Juergensmann <ij@2005.bluespice.org> writes:

After PostgreSQL migrated to the support of multiple PSQL instances installed on the same box, such as 7.4 and 8.0, the following library wasn't found anymore by drupal:

/usr/lib/postgresql/lib/plpgsql.so

I suspect that this has something to do with your PHP installation rather than Drupal. Drupal does not load plpgsql.so directly. Cheers, -Hilko