Alvaro Herrera <alvherre(at)commandprompt(dot)com> writes:
> Hmm, now that I think about it, maybe the problem is a mixture of the
> Makefile doing that and pg_config not doing it (or the other way
> around), by means of having moved the installation elsewhere (say if it
> was --prefix=/usr/pgsql and then moved into /usr, or vice versa).
Could be, but I don't want to speculate in advance of being able to
reproduce it ...
regards, tom lane