以下程序为什么连接通不过，说函数没定义？

[amble]

#include <GL/glut.h>

#include <stdlib.h>


void display(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(1.0,1.0,1.0);
glBegin(GL_POLYGON);
glVertex3f(0.25,025,0.0);
glVertex3f(0.75,0.25,0.0);
glVertex3f(0.75,0.75,0.0);
glVertex3f(0.25,0.75,0.0);
glEnd();


glFlush();
}



void init (void)
{
glClearColor(0.0,0.0,0.0,0.0);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0.0,1.0,0.0,1.0,-1.0,1.0);
}



int main(int argc,char ** argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
glutInitWindowSize(250,250);
glutInitWindowPosition(100,100);
glutCreateWindow("hello");
init();
glutDisplayFunc(display);
glutMainLoop();
return 0;
}

但是，我的库文件，都在。

[sstower]

具体点，那个函数通不过

[SevenFeng]

首先，你的工程中是否有OpenGL的链接库？其次，你的头文件是否在缺省的目录下面？请你在VC++编辑器中的“工程”中的“设置”中寻找答案。