...

Tom, I suspect that this is your work:
./psql: error in loading shared libraries : undefined symbol:
createPQExpBuffer

which happens if you run several versions of everything all at once and
forget to set all your lib paths right.

How about version numbering libpq properly? It has been 2.0 ever since I
can remember (not very long :). At least do ++0.0.1 when you change
something. Is there any particular reason why this is not done?

-- 
Peter Eisentraut - peter_e@gmx.net
http://yi.org/peter-e/