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As with initdb these programs need to run with a restricted token, and if they don't pg_upgrade will fail when run as a user with Adminstrator privileges. Backpatch to all live branches. On the development branch the code is reorganized so that the restricted token code is now in a single location. On the stable bramches a less invasive change is made by simply copying the relevant code to pg_upgrade.c and pg_resetxlog.c. Patches and bug report from Muhammad Asif Naeem, reviewed by Michael Paquier, slightly edited by me.
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 "gmake all" and "gmake
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.