Run time error while connecting to postgresql using SQLAPI++

Question

I'm very new to sqlapi++ . Based on the tutorial provided in the official website I tried connecting to postgresql database that is running on my system.

#include<stdio.h>
#include<conio.h>
#include<SQLAPI.h>

void main()
{
  SAConnection con;

  try
  {
   con.Connect("localhost@postgres","postgres","12345",
       SA_PostgreSQL_Client);

   printf("We are connected");
  }

   catch(SAException &x)
  {
    printf("%s\n",(const char*)x.ErrText());
  }

  _getch();
}

I'm programming in Visual studio 2010, the include path points to SQLAPI/include directory and the same for library, I have used release version of static library sqlapis.lib. The program is building but when I run it it shows error as

libpq.dll: The specified module could not be found. pq.dll: The specified module could not be found.

DBMS API Library loading fails This library is a part of DBMS client installation, not SQLAPI++ Make sure DBMS client is installed and this required library is available for dynamic loading

Can I know how to get rid of this ?