Libpq++ & Borland C++

I want to use Libpq++ wit borland c++. I try to use libpq++ libs in my application but i keep getting linker errors, Can anyone help Please. I was not able to use the available make files to compile the files so i had to do it in borland and create a package and add all the files to the package. I dont know what more to do. Here is my code :

...
PGconn * connection;
connection = PQconnectdb("dbname=db_gatecop");
PQfinish(connection);
...

and here is the error message:

[Linker Error] Unresolved external '_PQconnectdb' referenced from testing.Obj

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