If you need postgis or use django with postgres you'll need hstore, that is all major distro with the package postgresql-contrib
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.
If someone wants to actually filter through these and make sure there is a contrib sub-package, go for it.
This has sat in accepted for inclusion for 6 months now. Clearly, there is a lack of demand for the inclusion of this software, nobody has stepped up to provide a patch, maintain it, and properly integrate it. Closing as a result. Feel free to reopen but only when someone offers a patch via our proper patch submission methods and volunteers to be maintainer.