#include<stdio.h>
#include <stdlib.h>


#include<GL/glut.h>
void init(void)
{
    glClearColor(0.0,0.0,0.0,0.0);
    glshadeModel(GL_FLAT);//关闭渐变效果计算，两顶点之间的点与设置一个点相同
}
void display(void)
{
    glClear(GL_COLOR_BUFFER_BIT);
    glColor3f(1.0,1.0,1.0);
    glLoadIdentity();//透视投影
    gluLookAt(0.0,0.0,5.0,0.0,0.0,0.0,0.0,0.0,0.0);//观看视点在Z轴上方5
    gluScalef(1.0,2.0,1.0);
    glutWireCube(1.0);
    glFlush();
}
void reshape(int w,int h)
{
    glViewPoint(0.0,(GLsizei)h,(GLsizei)w);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glFrustum(-1.0,1.0,-1.0,1.0,1.5,20.0);//??
    glMatrixMode(GL_MODELVIEW);
}
int main(int argc,char**argv)
{
    glutInit(&argc,argv);
    glutInitDisplayMode(GULT_SINGLE|GLUT_RGB);
    glutInitWindowSize(500,500);
    glutInitWindowPostion(100,100);
    glutCreatWindow(argv[0]);
    init();
    glutDisplayFunc(display);
    glutreshapeFunc(reshape);
    glutMainLoop();
    return 0;
}

提示没有标识符，但不知道怎么改，自学中，请大虾帮忙

请各位大虾看看来，这几天怎么都解决不了