Here I have occi c++ application in centos operating system.when I compile my application using make file I got /usr/bin/ld: cannot find -locci collect2: ld returned 1 exit status error.

Employees.cpp file also:-

 #include "Employees.h"
    using namespace std;
    using namespace oracle::occi;

    int main (void)
    {
        Employees *pEmployees = new Employees();
        pEmployees->List();
        delete pEmployees;
        cout << "ENTER to continue...";
        cin.get();
        return 0;
    }

    Employees::Employees()
    {
        user = "sys";
        passwd = "sis123";
        db = "oel01:1521/OEL11GR1.SAND";
        env = Environment::createEnvironment(Environment::DEFAULT);
        try
       {
          con = env->createConnection(user, passwd, db);
       }
       catch (SQLException& ex)
       {
         cout << ex.getMessage();
       }
    }

    Employees::~Employees()
    {
        env->terminateConnection (con);
        Environment::terminateEnvironment (env);
    }

    void Employees::List()
    {
      /*
       * simple test method to select data from
       * the employees table and display the results
       */
        Statement *stmt = NULL;
        ResultSet *rs = NULL;
        string sql = "select employee_id, first_name, last_name " \
                   "from employees order by last_name, first_name";

        try
       {
         stmt = con->createStatement(sql);
       }
       catch (SQLException& ex)
      {
        cout << ex.getMessage();
       }
      if (stmt)
      {
        try
        {
          stmt->setPrefetchRowCount(32);
          rs = stmt->executeQuery();
        }
        catch (SQLException& ex)
        {
          cout << ex.getMessage();
        }
        con->terminateStatement(stmt);
      }
   }

======================

here also Employees.h file

#include <occi.h>
#include <iostream>
#include <iomanip>
using namespace oracle::occi;
using namespace std;
class Employees {
    public:
    Employees();
    virtual ~Employees();
    void List();
    private:
    Environment *env;
    Connection  *con;
    string user;
    string passwd;
    string db;
};

My make file is:-

Employees: Employees.cpp
    g++ -o Employees Employees.cpp \
    -I$(ORACLE_HOME)//usr/include/oracle/11.1/client \
    -L$(ORACLE_HOME) -lclntsh -locci

debug: Employees.cpp
    g++ -ggdb3 -o Employees Employees.cpp \
    -I$(ORACLE_HOME)/usr/include/oracle/11.1/client \
    -L$(ORACLE_HOME) -lclntsh -locci
clean:
    rm -f Employees

The sqlclient occi library already installed in /usr/include/oracle/11.1/client directory of centos The problem is on make file pls help me

If the path to the oracle headers is $(ORACLE_HOME)//usr/include/oracle/11.1/client (from the -I argument in your makefile) then I find it unlikely that the path to the libraries is $(ORACLE_HOME) (from the -L argument in your makefile) and it would seem much more likely to me to be $(ORACLE_HOME)//usr/lib/oracle/11.1/client (or something like that).