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Linking Issue

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I'm just not undertstanding what I'm doing wrong that the linker can't 
find my method function

I have this header file
questionss.h


#ifndef QUESTION
#define QUESTION
#include <cstdlib>
#include <cstdio>
#include <string>
#include <vector>
#include <iostream>
#include <iomanip>
#include <termios.h>

namespace Questions{

   class Question{

      public:
	 Question(std::string q, std::string a): quest(q), answer(a){ }
	 Question(){ }
	 Question(Question const &copy){
		 this->quest = copy.quest;
		 this->response = copy.response;
		 this->answer = copy.answer;
	 }
	 std::string quest;
	 std::string response;
	 std::string answer;







      private:



   };

   class Deck{

      public:
	 std::vector<Question> deck;
	 Deck(){
	    std::string home = std::getenv("HOME");
	    database = home + "/quiz.db";
	    size = 0;
	 }



	 void get_stack();
	 Question get_question();
	 void give_quiz();
	 void add_questions(Question &enter);
	 void add_database();
    	 Question create_question(std::ostream &os = std::cout, std::istream &in = std::cin );

      private:
	 int size;
	 std::string database;

   };


   void menu(std::ostream &os = std::cout);
   void selection(Deck, std::istream &in = std::cin);


} //end of namespace Question


#endif



this is a library file for questions ==> questions.cpp
/*
 * =====================================================================================
 *
 *       Filename:  questions.cpp
 *
 *    Description:  Questions Class
 *
 *        Version:  1.0
 *        Created:  06/05/2011 07:08:05 PM
 *       Revision:  none
 *       Compiler:  gcc
 *
 *         Author:  Ruben Safir (), ruben@mrbrklyn.com
 *        Company:  NYLXS
 *
 * =====================================================================================
 */

#include <cstdlib>
#include <cstdio>
#include <string>
#include <vector>
#include <iostream>
#include <iomanip>
#include <termios.h>
#include "questions.h"

namespace Questions{

   Question Deck::create_question(std::ostream &os , std::istream &in ){
      struct termios stored_settings;
      struct termios new_settings;
      std::string input_q, input_a;
      char keystroke;


      os << "Please Enter your question below \n Enter <esc> when finished" << std::endl;
      os << "==================================================================" << std::endl;

      tcgetattr(0,&stored_settings);

      new_settings = stored_settings;

      /* Disable canonical mode, and set buffer size to 1 byte */
      new_settings.c_lflag &= (~ICANON);
      new_settings.c_cc[VTIME] = 0;
      new_settings.c_cc[VMIN] = 1;

      tcsetattr(0,TCSANOW,&new_settings);

      while( (keystroke = getchar()) ){
	 if (keystroke == 27)
	    break;
	 input_q += keystroke;
      }
      os << "Please Enter your answer below \n Enter <esc> when finished" << std::endl;
      os << "==================================================================" << std::endl;

      while( (keystroke = getchar()) ){
	 if (keystroke == 27)
	    break;
	 input_a += keystroke;
      }

      Question quest(input_q, input_a);




      tcsetattr(0,TCSANOW,&stored_settings);
      return quest;
   }

   void menu(std::ostream &os){
      os << "Welcome the the C++ Quiz" << "\n\n\n\n" << std::endl;
      std::string tmp = " \n "
	 "Select from one of the following: \n\n"
	 "a) Insert Question and Answer into the database\n"
	 "b) Read 25 Questions and run Quiz\n\n\nResponse==> ";

      os << tmp << std::endl;

   }


   void selection(Deck &stack, std::istream &is = std::cin) {
      char choice;
      Question tmp;
      if(is >> choice){

	 switch ( choice ) {
	    case 'a':
	       tmp = stack.create_question();
	       stack.add_questions(tmp);
	       break;

	    case 'b':	
	       break;

	    default:	
	       break;
	 }				/* -----  end switch  ----- */
      }
   }

}         /* End of Namespace Questions */


And this is the main program

#include <iostream>
#include "questions.h"
#include <string>
#include <vector>

int main(int argv, char *argc[]){

  Questions::Deck stack;

  Questions::menu();
  Questions::selection(stack);

  return 0;
}

and this is the makefile
CXX:=g++
CXXFLAGS:=-Wall -ggdb -pg
LDFLAGS:= -pg

quiz : quiz.o questions.o
	$(CXX) $(LDFLAGS) -o quiz quiz.o questions.o 

quiz.o : quiz.cpp questions.h
	$(CXX) $(LDFLAGS) -c quiz.cpp

questions.o : questions.cpp questions.h
	$(CXX) $(LDFLAGS) -c questions.cpp



include make.deps
make.deps: *.cpp; ${CXX} ${CXXFLAGS} -M *.cpp >$@




when I compile it I'm getting a linker error


:!make  2>&1| tee /tmp/vo1mDhy/8
g++ -pg -o quiz quiz.o questions.o
quiz.o: In function `main':
quiz.cpp:(.text+0x4b): undefined reference to `Questions::selection(Questions::Deck, std::basic_istream<char, std::char_traits<char> >&)'
questions.o: In function `Questions::selection(Questions::Deck&, std::basic_istream<char, std::char_traits<char> >&)':
questions.cpp:(.text+0x468): undefined reference to `Questions::Deck::add_questions(Questions::Question&)'
collect2: ld returned 1 exit status
make: *** [quiz] Error 1
(1 of 7): g++ -pg -o quiz quiz.o questions.o



The function is sitting there as plain as daylight
  class Deck{

      public:
	 std::vector<Question> deck;
	 Deck(){
	    std::string home = std::getenv("HOME");
	    database = home + "/quiz.db";
	    size = 0;
	 }



	 void get_stack();
	 Question get_question();
	 void give_quiz();
	 void add_questions(Question &enter); <<==========

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Thread

Linking Issue Ruben Safir <ruben@mrbrklyn.com> - 2011-06-06 01:19 +0000
  Re: Linking Issue "Paul" <pchristor@yahoo.co.uk> - 2011-06-06 02:51 +0100
    Re: Linking Issue red floyd <redfloyd@gmail.com> - 2011-06-06 10:16 -0700
      Re: Linking Issue "Paul" <pchristor@yahoo.co.uk> - 2011-06-06 20:22 +0100
      Re: Linking Issue Joshua Maurice <joshuamaurice@gmail.com> - 2011-06-06 14:06 -0700
  Re: Linking Issue Ruben Safir <ruben@mrbrklyn.com> - 2011-06-06 01:52 +0000
  Re: Linking Issue Joshua Maurice <joshuamaurice@gmail.com> - 2011-06-05 19:01 -0700
    Re: Linking Issue Ruben Safir <ruben@mrbrklyn.com> - 2011-06-06 02:18 +0000
      Re: Linking Issue "Paul" <pchristor@yahoo.co.uk> - 2011-06-06 03:24 +0100
  Re: Linking Issue red floyd <redfloyd@gmail.com> - 2011-06-06 10:18 -0700
    Re: Linking Issue ruben safir <ruben@mrbrklyn.com> - 2011-06-06 14:41 -0400
      Re: Linking Issue Paavo Helde <myfirstname@osa.pri.ee> - 2011-06-06 16:21 -0500

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