libpq++ linking

Hello!

I try to use libpq++ (linux: redhat4.2, postgresql-(devel)?-6.2 GNU c)
And i have problem with linking:

[root@3dom neko]# g++ -I/usr/include/postgres/ -lpq++ -o a a.cc
/tmp/cca032541.o: In function 
ain':
/tmp/cca032541.o(.text+0x22): undefined reference to gConnection::Exec(char
const *)'
...
And more like this. But where is this famous exec?

[root@3dom neko]# nm -C /usr/lib/libpq++.a | grep 'Exec(char'
00000348 T PgConnection::Exec(char const *)
         U PgConnection::Exec(char const *)

All right. In libpq++.
And I use this lib?
[root@3dom neko]# mv /usr/lib/libpq++.a .
[root@3dom neko]# g++ -I/usr/include/postgres/ -lpq -lpq++ -o e e.cc
ld: cannot open -lpq++: No such file or directory
Yes. We were use before this.
And include-s is too works.

My first program:
--------    x    --------
#include <postgres/libpq++.h>
#ifndef PGDATABASE_H
  main(){;};
#else // PGDATABASE_H
#include <iostream.h>
main(){
        ExecStatusType XStat;
        PgDatabase conn("tval");
        XStat=conn.Exec("select oid from szak order by oid ;");
        for (int i=0,max=conn.Tuples();max>i;i++) {
                cout << conn.GetValue(i,0) << endl;
        }
}
#endif // PGDATABASE_H
--------    x    --------

I mean, i try all what i can. But somewhere i must done a mistake.
BUT where?!

Please help me...

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