[Help-glpk] Pseudo boolean constraint

[Henri Gourvest]

I have a special constraint:

  x1 + x2 + x3 >=  2
or
  x1 + x2 + x3 <= 0

I want the result set to be:
0 0 0
1 1 0
1 0 1
0 1 1
1 1 1

But the constraints seem to be unsatisfaible because I don't know how to 
write the "OR" constraint.
I'm not sure it is possible but perhaps someone have an idea ...

Thanks

Henri