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  1. or download this
     
$ h2xs -n Book::Factorial -A -O -x -F factorial.h
Defaulting to backwards compatibility with perl 5.10.1
...
Writing Book-Factorial/t/Book-Factorial.t
Writing Book-Factorial/Changes
Writing Book-Factorial/MANIFEST
  2. or download this
    #include "EXTERN.h"
#include "perl.h"
...
double
factorial_recursive_c(x)
    int    x