su
su - postgres
createuser mike
createdb -E UTF8 -O mike gis
createlang plpgsql gis
psql -d gis -f /usr/share/postgresql/contrib/lwpostgis.sql
echo "ALTER TABLE geometry_columns OWNER TO mike; ALTER TABLE spatial_ref_sys OWNER TO mike;"  | psql -d gis
ACCEPT_KEYWORDS="~x86" USE="postgres proj doc gdal python bidi" emerge mapnik
ACCEPT_KEYWORDS="~x86" emerge osm2pgsql
psql -d gis -f /usr/share/postgresql/contrib/90000.sql