CentOS-5 PostgreSQL 8.1.9 server instrumentation

I wish to enable server instrumentation for pgadmin3 on a CentOS-5 box
running the stock PostgreSQL 8.1.9 installed via yum. Can someone tell me
where I get the necessary support files and scripts for CentOS to
accomplish this?  I installed postgres-contrib but cannot find a script
called admin81.sql which pgadmin3 indicates as necessary to enable these
features.  yum whatprovides does not provide any useful information
either.

sincerely,

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