libpq question

I seem to be unable to compile a simple C++ file to access Postgresql
from what I believe are the C interfaces in the libpq (++) package.
(Suse 10.2, PostgreSQL 8.1.5)

I get the following errors (I searched the entire drive for libpq-fe.h
and it doesn't exist after installing all the libpq packages. Do I need
something else?

I installed all the libpq packages from the distribution CD:

Name Avail. Vers.Inst. Vers.Summary Size

libpq++ 4.0 4.0 C++ Client Library for PostgreSQL
100.0 K
libpq 2.5.5 2.5.5 C++ Client Library for PostgreSQL
435.0 K
libpq-devel 2.5.5 2.5.5 C++ Client Library for PostgreSQL
5.0 M

Compile Error:

g++ -I /usr/include/pgsql -c client.cpp
In file included from /usr/include/pgsql/libpq++.h:30,
from client.cpp:9:
/usr/include/pgsql/libpq++/pgconnection.h:30:22: error: libpq-fe.h: No
such file or directory
/usr/include/pgsql/libpq++/pgconnection.h:48: error: invalid function
declaration
/usr/include/pgsql/libpq++/pgdatabase.h:37: error: invalid function
declaration
/usr/include/pgsql/libpq++/pglobject.h:38: error: invalid function
declaration
/usr/include/pgsql/libpq++/pgtransdb.h:38: error: invalid function
declaration
/usr/include/pgsql/libpq++/pgcursordb.h:44: error: invalid function
declaration