Postgres 6.5 and PQsetdb(,,"-F",,)

Hello,

I just upgraded from Postgres 6.3.2 (shipped with RedHat) to latest 6.5
on a Linux system, with an existing application.

Everything went smoothly, but it seems that "-F" option in PQsetdb
no longer works.

I tried to launch postmaster  with -F  option and it works as expected,
but I really want to enable /disable fsync from libp, so I can run
lengthly updates of my database reasonnably fast at the risk of problems

if the system crash, and keep safe fsync for short opearations.

I found nothing about that on the mailing list. What did I miss ?

Thanks in advance...

Jean-Denis Girard,
Essential Software.