error LNK2001: unresolved external symbol

#include <Windows.h>
#include <gl/GL.h>
#include <gl/GLU.h>
#include <gl/GLAUX.H>
#pragma comment(linker, "/SUBSYSTEM:WINDOWS")




HDC g_HDC;
float angle = 0.0f;
float legAngle[2] = {0.0f, 0.0f};
float armAngle[2] = {0.0f, 0.0f};
bool fullscreen = false;



void DrawCube(float xPos, float yPos, float zPos)
{
	glPushMatrix();
	glBegin(GL_POLYGON);

	//top face
	glVertex3f(0.0f, 0.0f, 0.0f);
	glVertex3f(0.0f, 0.0f, -1.0f);
	glVertex3f(-1.0f, 0.0f, -1.0f);
	glVertex3f(1.0f, 0.0f, 0.0f);

	//front face
	glVertex3f(0.0f, 0.0f, 0.0f);
	glVertex3f(-1.0f, 0.0f, 0.0f);
	glVertex3f(-1.0f, -1.0f, 0.0f);
	glVertex3f(0.0f, -1.0f, 0.0f); 

	//This is the right face
    glVertex3f(0.0f, 0.0f, 0.0f);
    glVertex3f(0.0f, -1.0f, 0.0f);
    glVertex3f(0.0f, -1.0f, -1.0f);
    glVertex3f(0.0f, 0.0f, -1.0f);

    //This is the left face
    glVertex3f(-1.0f, 0.0f, 0.0f);
    glVertex3f(-1.0f, 0.0f, -1.0f);
    glVertex3f(-1.0f, -1.0f, -1.0f);
    glVertex3f(-1.0f, -1.0f, 0.0f);

    //This is the bottom face
    glVertex3f(0.0f, 0.0f, 0.0f);
    glVertex3f(0.0f, -1.0f, -1.0f);
    glVertex3f(-1.0f, -1.0f, -1.0f);
    glVertex3f(-1.0f, -1.0f, 0.0f);

    //This is the back face
    glVertex3f(0.0f, 0.0f, 0.0f);
    glVertex3f(-1.0f, 0.0f, -1.0f);
    glVertex3f(-1.0f, -1.0f, -1.0f);
    glVertex3f(0.0f, -1.0f, -1.0f);

	glEnd();
	glPopMatrix();
}

//draws an arm
void DrawArm(float xPos, float yPos, float zPos)
{
	glPushMatrix();

	//sets colour to red
	glColor3f(1.0f, 0.0f, 0.0f);
	glTranslatef(xPos, yPos, zPos);

	//draws a cube
	glScalef(1.0f, 4.0f, 1.0f);
    DrawCube(0.0f, 0.0f, 0.0f);

	glPopMatrix();
}

//draw a head
void DrawHead(float xPos, float yPos, float zPos)
{

	glPushMatrix();
	//sets colour to white
	glColor3f(1.0f, 1.0f, 1.0f);
	glTranslatef(xPos, yPos, zPos);

	//crates 2x2 cube
	glScalef(2.0f, 2.0f, 2.0f);
	DrawCube(0.0f, 0.0f, 0.0f);

	glPopMatrix();

}
//draws torso
void DrawTorso(float xPos, float yPos, float zPos)
{
	glPopMatrix();
	//sets colour to blue
	glColor3f(0.0f, 0.0f, 0.0f);
	glTranslatef(xPos, yPos, zPos);

	//creates 3 x 5 x 1 cube
	glScalef(3.0f, 5.0f, 1.0f);
	DrawCube(0.0f, 0.0f, 0.0f);

	glPopMatrix();
}
//draws leg
void DrawLeg(float xPos, float yPos, float zPos)
{
	glPushMatrix();

	//Sets colour to Yellow
	glColor3f(1.0f, 1.0f, 0.0f);
	glTranslatef(xPos, yPos, zPos);

	//creates 1 x 5 x 1 cube 
	glScalef(1.0f, 5.0f, 1.0f);
	DrawCube(0.0f, 0.0f, 0.0f);
}

void DrawRobot(float xPos, float yPos, float zPos)

{
	static bool leg1 = true;
    static bool leg2 = false;
    static bool arm1 = true;
    static bool arm2 = false;

    glPushMatrix();
     
	glTranslatef(xPos, yPos, zPos);

	//location of robot
    DrawHead(1.0f, 2.0f, 0.0f);
	DrawTorso(1.5, 0.0, 0.0f);
	glPushMatrix();

}