Installing debugger?

The current instructions at www.pgadmin.org on how to install the
PL/pgSQL debugger read:

"In order to use the debugger, a plugin is required on your server. This
is included by default with EnterpriseDB, and is available for download
on pgFoundry. It is installed as a contrib module with the Windows
distribution of PostgreSQL 8.3 and above."

However, the only download available from pgFoundry dates back to
PostgreSQL 8.2, implying that it may not be compatible with 8.4.
Further, there are no PGXS installation instructions for users who did
not install from source.

So ... does the debugger even still work?  And if it does, how do I
install it on an RHEL system with 8.4.2 RPM installed?

--Josh