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. 

protobuf-c is an optional dependency for MapBox vector tile support.

To disable the GTK-based graphical interface for shp2pgsql, set GUI=no.

To include the shp2pgsql plugin for pgAdmin set PGADMIN=yes.