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), much like ESRI's
SDE or Oracle's Spatial extension. PostGIS follows the OpenGIS "Simple
Features Specification for SQL" and has been certified as compliant
with the "Types and Functions" profile.  PostGIS/PostgreSQL includes
the following functionality:
* Simple Features as defined by the OpenGIS Consortium (OGC)
* Support for Well-Known Text and Well-Known Binary
  representations of GIS objects
* Fast spatial indexing using GiST
* Geospatial analysis functions
* PostgreSQL JDBC extension objects corresponding to the
  geometries
* Support for OGC access functions as defined by the Simple
  Features Specification

Based on package in pkgsrc-wip by mchittur@cs.nmsu.edu.  Updated to
not require building in PG source dir now that postgresql81-client
installs the "server" include fies.

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