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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);


	//Draw our boundraries 
		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);


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

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