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Neither plperl nor plpython installed sufficient header files to permit transform modules to be built out-of-tree using PGXS. Fix that by installing all plperl and plpython header files (other than those with special purposes such as generated data tables), and also install plpython's special .mk file for mangling regression tests. (This commit does not fix the windows install, which does not currently install _any_ plperl or plpython headers.) Also fix the existing transform modules for hstore and ltree so that their cross-module #include directives work as anticipated by commit df163230b9 et seq. This allows them to serve as working examples of how to reference other modules when doing separate out-of-tree builds. Discussion: https://postgr.es/m/87o9ej8bgl.fsf%40news-spur.riddles.org.uk
The PostgreSQL contrib tree
---------------------------
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.