Illigal Istruction

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Illigal Istruction

justgiveit5000
  Hello, I am running Ubuntu 8.04 and opencv1.1 and when I try to run
sudo ./lkdemo it gives me this message:

vfedko@vfedko-d:/usr/src/opencv-1.1.0/samples/c$ sudo ./lkdemo
Welcome to lkdemo, using OpenCV version 1.1.0 (1.1.0)
Hot keys:
        ESC - quit the program
        r - auto-initialize tracking
        c - delete all the points
        n - switch the "night" mode on/off
To add/remove a feature point click it
Illegal instruction

what is going on?