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Display list error

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my .h file :
  ...
  ...

extern GLuint boardList;

...
...
my .cpp file
GLvoid buildList()
{
 
	boardList = glGenLists(1);

	glNewList(boardList,GL_COMPILE);

	glLineWidth(5);
	
	//Draw our boundraries 
	glBegin(GL_QUADS);
		glColor3f(0.0f,0.0f,1.0f);		glVertex2f(-ScreenWidth,ScreenHeight);
		glColor3f(1.0f,1.0f,0.0f);		glVertex2f(-ScreenWidth,-ScreenHeight);
		glColor3f(0.0f,0.0f,1.0f);		glVertex2f(ScreenWidth,-ScreenHeight);
		glColor3f(1.0f,1.0f,0.0f);		glVertex2f(ScreenWidth,ScreenHeight);

	glEnd();
glEndList();
}

ERROR : error LNK2001: unresolved external symbol "unsigned int boardList" (?boardList@@3IA)

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