The PostgreSQL contrib tree

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This subtree contains porting tools, analysis utilities, and plug-in

features that are not part of the core PostgreSQL system, mainly

because they address a limited audience or are too experimental to be

part of the main source tree. This does not preclude their

usefulness.

User documentation for each module appears in the main SGML

documentation.

When building from the source distribution, these modules are not

built automatically, unless you build the "world" target. You can

also build and install them all by running "make all" and "make

install" in this directory; or to build and install just one selected

module, do the same in that module's subdirectory.

Some directories supply new user-defined functions, operators, or

types. To make use of one of these modules, after you have installed

the code you need to register the new SQL objects in the database

system by executing a CREATE EXTENSION command. In a fresh database,

you can simply do

CREATE EXTENSION module_name;

See the PostgreSQL documentation for more information about this

procedure.