I noticed that two of the buildfarm members are failing the 8.1 branch
because they're trying to build plpython with python 2.5. To get that
to work, I think we'd need to back-patch these two fixes:
http://archives.postgresql.org/pgsql-committers/2006-11/msg00165.php
http://archives.postgresql.org/pgsql-committers/2007-04/msg00043.php
Is that worth doing? Should we go further back than 8.1?
regards, tom lane