C++ interface problem with libpq.so.3

I have writte a simple program to access PGDB from a C++ program using
the libpq++-4.0

Most of time it runs perfect. This morning, it was working fine. Then
later it stopped working.
The symptom is that my program went to asleep.

The stack trace:

#0 0xffffe002 in ?? ()
#1 0x40120808 in pqSocketPoll () from /usr/local/pgsql/lib/libpq.so.3
#2 0x401206ed in pqSocketCheck () from /usr/local/pgsql/lib/libpq.so.3
#3 0x401205f7 in pqWaitTimed () from /usr/local/pgsql/lib/libpq.so.3
#4 0x401205b6 in pqWait () from /usr/local/pgsql/lib/libpq.so.3
#5 0x4011e13a in PQgetResult () from /usr/local/pgsql/lib/libpq.so.3
#6 0x4011e3fb in PQexecFinish () from /usr/local/pgsql/lib/libpq.so.3
#7 0x4001a722 in PgConnection::Exec(char const*) ()
from /usr/local/pgsql/lib/libpq++.so.4
#8 0x4001a798 in PgConnection::ExecTuplesOk(char const*) ()
from /usr/local/pgsql/lib/libpq++.so.4
#9 0x0804d695 in main (argc=9, argv=0xbfffd6d4) at tabaln.cpp:112
#10 0x42015574 in __libc_start_main () from /lib/tls/libc.so.6

=====
looks like that it is having trouble loading a function.

Is my computer system screewed up, is my compiler (gcc 3.3) doing
something wrong, or what?
If you have seen this behavior let me know. I am kind of having no clue
where to start.

Kemin

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