I am trying to have synchronous master-master replication in PostgreSQL8.4 using PgPool II. I am not able to configure PgPool on the system, it gives me an error, libpq is not installed or libpq is old.
(FYI: This topic is probably more germane to the -ADMIN list, or at least -GENERAL, than it is to -PERFORM.)
Is there a particular reason you're building pgpool, rather than installing it via your distribution's package manager? Most distributions have it available these days. (At a minimum, any distribution that's widely-used and well-enough understood to warrant hosting something as critical as your RDBMS should have it.)
FWIW, I'm successfully using pgpool-II against a pair of 8.4 instances (in the connection pool mode, not replication, and all installed from the PGDG RPM repository). I'm also using Bucardo (in its multi-master/swap mode) to handle the replication, as suggested by someone else down-thread. So there's an existence proof that it *can* work.
Finally, when PostgreSQL is installed, libpq.so.N is usually put under /usr/lib(64)/, not under the postgres install directory. Your distribution should have a postgresql-devel package available which will provide a pg_config command that can be used to pass the *actual* installed locations to a configure invocation, as in:
./configure --with-pgsql-libdir=`pg_config --libdir`...
rls
:wq
