مشکل این برنامه چیه؟

وقتی برنامه زیر رو کامپایل میکنم:

#include <windows.h>

#include <GL/gl.h>

#include <GL/glu.h>

#include <GL/glaux.h>

#include <stdio.h>



void myinit(void);

void CALLBACK myReshape(GLsizei w, GLsizei h);

void CALLBACK display(void);



void myinit(void)

{

    GLfloat values[2];

    glGetFloatv (GL_LINE_WIDTH_GRANULARITY, values);

    //printf ("GL_LINE_WIDTH_GRANULARITY value is %3.1f\n", values[0]);



    glGetFloatv (GL_LINE_WIDTH_RANGE, values);



    //printf ("GL_LINE_WIDTH_RANGE values are %3.1f %3.1f\n",

    //values[0], values[1]);



    glEnable (GL_LINE_SMOOTH);

    glEnable (GL_BLEND);

    glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

    glHint (GL_LINE_SMOOTH_HINT, GL_DONT_CARE);

	glLineWidth (1.5);



    glShadeModel(GL_FLAT);

    glClearColor(0.0, 0.0, 0.0, 0.0);

    glDepthFunc(GL_LESS);

    glEnable(GL_DEPTH_TEST);

}





void CALLBACK display(void)

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glColor4f (1.0, 1.0, 1.0, 1.0);

    auxWireIcosahedron(1.0);

    glFlush();

}



void CALLBACK myReshape(GLsizei w, GLsizei h)

{

    if (!h) return;

    glViewport(0, 0, w, h);

    glMatrixMode(GL_PROJECTION);

    glLoadIdentity();

    gluPerspective (45.0, (GLfloat) w/(GLfloat) h, 3.0, 5.0);



    glMatrixMode(GL_MODELVIEW);

    glLoadIdentity ();

    glTranslatef (0.0, 0.0, -4.0);  /*  move object into view   */

}



WINAPI _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow)

{

    auxInitDisplayMode (AUX_SINGLE | AUX_RGB | AUX_DEPTH16);

    auxInitPosition (0, 0, 400, 400);

    auxInitWindow ("Antialiased Lines Using RGBA");

    myinit();

    auxReshapeFunc (myReshape);

    auxMainLoop(display);

    return(0);

}

این خطا رومیده:

[ILINK32 Error] Error: Unresolved external 'WinMain' referenced from D:\PROGRAM FILES\CODEGEAR\RAD STUDIO\6.0\LIB\C0W32.OBJ

مشکلش چیه؟
ممنون.