[Dev-C++] undefined reference problem

[mohamad c. <moh...@in...>]

Hi all,
I'm new to g++. I'm trying to use a new library for linear algebra=20
called Lapack++, the problem is when I include this library into a=20
source file I get errors of kinds "undefined refernce". for example this=20
little and stupid code:
#define LA_COMPLEX_SUPPORT
#include <lapack++.h> // the new library
#include <iostream>
int main()
{
   LaGenMatDouble A ; // this uses the new library=20
   std::cout<< "This is a test  "<< std::endl;
   return 0;
}
the erros are like:
/tmp/cc2YU0wo.o(.text+0x19): In function `main':
undefined reference to =AB LaGenMatDouble::LaGenMatDouble[in-charge]()=BB

What could be the problem?
Please give me some feddback.
thanks in advance