CGAL and Ruby not playing nice together

gistfile1.cpp

//hello_world.cpp
//The following DOESN'T compile
#include <ruby.h>

#include <boost/shared_ptr.hpp>

#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Polygon_2.h>
#include <CGAL/create_straight_skeleton_2.h> //ADDING THIS CAUSES COMPILATION TO FAIL
 
static VALUE tosCore;
 
static VALUE my_function( VALUE self )
{
    VALUE str = rb_str_new2( "Hello World!" );
    return str;
}
 
extern "C"
void Init_hello_world( void )
{    
    tosCore = rb_define_module("Core");
    rb_define_module_function(
        tosCore, "my_method", reinterpret_cast<VALUE(*)(...)>(my_function),0);   
}