Getting the red out (of the buildfarm)

We have a number of buildfarm members that have been failing on HEAD
consistently for some time.  It looks from here that the following
actions need to be taken:

tapir, cardinal: need a newer version of "flex" installed

wombat, eukaryote, chinchilla: these are all failing withLOG:  could not bind IPv4 socket: Address already in useHINT:
Isanother postmaster already running on port 5678? Ifnot, wait a few seconds and retry.
 
This presumably indicates that a postmaster is hanging around from
a previous test and needs to be killed manually.  The fact that
this started to happen about ten days ago on all three machines
suggests a generic failure-to-shut-down problem in the buildfarm script.
I wonder how up-to-date their scripts are.

comet_moth, gothic_moth: these are failing the new plpython_unicode test
in locale cs_CZ.ISO8859-2.  Somebody needs to do something about that.
If it's left to me I'll probably just remove the test that has multiple
results.
        regards, tom lane