无法实现计算机图形学第四版中第一个完整的OpenGl程序示例

#include<GL/glut.h>
void init(void)
{
glClearColor(1.0, 1.0, 1.0, 0.0);
glMatrixMode(GL_PROJECTION);
gluOrtho2D(0.0, 200.0, 0.0, 150.0);
}
void lineSegment(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(0.0, 0.4, 0.2);
glBegin(GL_LINE);
glVertex2i(180, 15);
glVertex2i(10, 145);
glEnd();
glFlush();
}
void main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
glutInitWindowPosition(50, 100);
glutInitWindowSize(400, 300);
glutCreateWindow("A Example OpenGL program");
init();
glutDisplayFunc(lineSegment);
glutMainLoop();
}