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+PostGIS adds support for geographic objects to the PostgreSQL
+object-relational database. In effect, PostGIS "spatially
+enables" the PostgreSQL server, allowing it to be used as a
+backend spatial database for geographic information systems
+(GIS).
+
+SFCGAL is an optional dependency for advanced 3D support.
+These advanced functions are not included in the postgis
+extension, but they can be make available by loading
+/usr/share/postgresql/contrib/postgis-2.1/sfcgal.sql.
+
+To disable the GTK-based graphical interface for shp2pgsql,
+set GUI=no.