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One more simple question. To use the kernel
Exact_predicates_exact_constructions_kernel, is necessary to have instaled 
LEDA
library previously or something? I'm trying to use this kernel but always 
shows
me the sames errors.

I've tested this simple example of CGAL Manual, but doesn't work.

#include <CGAL/Exact_predicates_exact_constructions_kernel.h>
#include <CGAL/Polyhedron_3.h>
#include <CGAL/IO/Polyhedron_iostream.h>
#include <CGAL/Nef_polyhedron_3.h>
#include <CGAL/Nef_3/SNC_indexed_items.h>
#include <CGAL/IO/Nef_polyhedron_iostream_3.h>

typedef CGAL::Exact_predicates_exact_constructions_kernel Kernel;
typedef CGAL::Polyhedron_3<Kernel>  Polyhedron;
typedef CGAL::SNC_indexed_items Items;
typedef CGAL::Nef_polyhedron_3<Kernel, Items>  Nef_polyhedron;

int main() {

  Polyhedron P;
  std::cin >> P;
  Nef_polyhedron N(P);

  std::cout << "Exact_predicates_exact_constructions_kernel +
SNC_indexed_items"
            << std::endl
            << "  allows efficient handling of input "
                 "using floating point coordinates"
            << std::endl;

  if(N.is_simple()) {
    N.convert_to_Polyhedron(P);
    std::cout << P;
  } 
  else {
    std::cout << N;
  }
}

The errors are the sames that I had in my code.