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[sara <>]

Hi , 

I am using CGAL-4.1 on ubuntu platform (Linux)
I am very interested to run CGAL demo and see its possibilities.
Now I am testing  demo . 
I have configure demo with cmake once then  change directory to my root
/home/sara/CGAL-4.1 then press configure again and then generate . and by
using terminal I make the demo . this is result of  ./chull_3d-geomview-demo
This is the error 


sara@ubuntu:~$ cd /home/sara/CGAL-4.1/demo/Convex_hull_d/build
sara@ubuntu:~/CGAL-4.1/demo/Convex_hull_d/build$ ./chull_3d-geomview-demo
Starting Geomview...execl geomview failed
error number 2 (check `man execlp')
terminate called after throwing an instance of 'CGAL::Assertion_exception'
  what():  CGAL ERROR: assertion violation!
File: /home/sara/CGAL-4.1/src/CGAL/Geomview_stream.cpp
Line: 119
sara@ubuntu:~/CGAL-4.1/demo/Convex_hull_d/build$ 


there is a same error for some other demo for example Convex_hull_3
Thanks in advance   






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