Depth problems

I'm having a problem with depth testing with SDL/Linux. The problem is that whenever I try to draw something with a depth greater than 1.0, it gets clipped, despite the call to glFrustum setting the far plane, and a call to disable depth testing. Does anybody know anything I might have forgotten to do? Thanks. A short summary of the OpenGL state that doesn't work.

glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(-4.5, 4.5, 4.5, -4.5, .5, 5000);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();

glDisable(GL_DEPTH_TEST);

glBegin(GL_QUADS);

glVertex3f(0, 0, 2);
glVertex3f(0, 1, 2);
glVertex3f(1, 1, 2);
glVertex3f(1, 0, 2);

glEnd();
 

[edited by - rotos on December 13, 2002 8:12:52 PM]