A change was recently committed to PostgreSQL HEAD (8.2devel) that affects arrays; among other things it removes the ARR_OVERHEAD macro that PostGIS uses. http://archives.postgresql.org/pgsql-committers/2005-11/msg00385.php http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/utils/array.h.diff?r1=1.55&r2=1.56 -- Michael Fuhr