contrib/hstore - missing, deleted or not material for contrib ?

If looking at http://www.sai.msu.su/~megera/oddmuse/index.cgi?Hstore the 
following is displayed :

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License

Stable version, included into PostgreSQL distribution, released under BSD 
license. Development version, available from this site, released under the 
GNU General Public License, version 2 (June 1991).

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But I never found it in my contrib dir - is it just me that overlooked it and 
have it been removed or has it never been included ? I would really like it 
to be included for ease of installation on linux systems - if pgxs will fix 
this so it can be compiled as a "standalone" extension then it is a solution 
I can live with.

Best regards,
Nicolai Petri