[Threads-list] can't build test.cpp, with threads

[Shea M. <sh...@sh...>]

I am relatively new to g++. I am trying to build a simple test program using
C++Threads, and the pthreads class.

I am pretty sure I have the implementation correct, but I keep getting this
compiler output.

username#  g++ test.cpp
/tmp/ccuC6dDp.o: In function `numbers::numbers(int)':
/tmp/ccuC6dDp.o(.text+0x13): undefined reference to
`cpp_threads::pthread::pthread(int)'
/tmp/ccuC6dDp.o(.text+0x37): undefined reference to
`cpp_threads::pthread::~pthread(void)'
/tmp/ccuC6dDp.o: In function `numbers::~numbers(void)':
/tmp/ccuC6dDp.o(.text+0x76): undefined reference to
`cpp_threads::pthread::~pthread(void)'
/tmp/ccuC6dDp.o: In function `numbers type_info function':
/tmp/ccuC6dDp.o(.gnu.linkonce.t.__tf7numbers+0x10): undefined reference to
`cpp_threads::pthread type_info function'
/tmp/ccuC6dDp.o(.gnu.linkonce.t.__tf7numbers+0x1a): undefined reference to
`cpp_threads::pthread type_info node'
collect2: ld returned 1 exit status

It looks to me like a linking issue.  I am guessing that I need another option
in my build command "g++ test.cpp".

Below is my code:
#include <iostream>
#include <string>
#include <thread.h>
using namespace std;
using namespace cpp_threads;

class numbers : public pthread
{
 public:
  numbers(int id);
  ~numbers();
  int thread(void *ptr);
};

/*
numbers::numbers(void *ptr)
 : pthread(ptr)
{}
*/

numbers::numbers(int id)
 :pthread(id)
{

}

numbers::~numbers()
{}

int numbers::thread(void *ptr)
{
 int i;
 for(i=0; i<1000; i++)
 {
  cout <<"->"<< i << endl;
 }

 return 0;
}

int main()
{
 cout <<"before calling thread.\n";
 //this is where I want my test thread() to start.
 cout <<"AFTER calling the thread\n";

 return 0;
}