Rotating an object around a fixed point in opengl

I have a problem with this openGL code:

glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glPushMatrix(); // put current matrix on stack

//glTranslatef(0.0f, 0.0f, 0.0f);   
//glTranslatef(-4*1.5, 0.0, 4*1.5);

glRotatef(rotationAngle, 0.0f, 1.0f, 0.0f); // rotate the robot on its y-axis
glTranslatef(xpos, ypos, zpos);
DrawRobot(xpos, ypos, zpos); // draw the robot
glPopMatrix();

What should I do to make my robot turn around the point at which it is currently situated and not around the origin? I think the problem lies in this snippet.