X11 stopped working

[Caleb Stein]

I was updating some ports (glib, png, jpeg, atk), and I did it  
incorrectly, by doing "make deinstall" and then "make install".  After I  
rebooted X11 won't run at all.  I tried to run "portupgrade -Rr xorg" but  
I didn't help.  I have KDE4 configured to run at startup, and it tries to  
run, and then exits to the prompt with this message:

Received unknown or unexpected command -2 from greeter
Abnormal termination of greeter for display :0, code 1, signal 0

How should I go about fixing this?