The newbie's question about wrapping c++ class with pyrex

Hi, experts,

I am following the tutorial at http://wiki.cython.org/WrappingCPlusPlus, 
and found a minor issue,

cdef class Rectangle:
  - c_Rectangle *thisptr # hold a C++ instance which we're wrapping
  + cdef c_Rectangle *thisptr # hold a C++ instance which we're wrapping

I need the above change to make it successfully compiled by cython. 
While, when I tried to compile it with pyrexc, I met following errors,

$ pyrexc --cplus rect.pyx
rect.pyx:4:21: Non-extern C function declared but not defined
rect.pyx:5:21: Non-extern C function declared but not defined
rect.pyx:6:19: Non-extern C function declared but not defined
rect.pyx:7:17: Non-extern C function declared but not defined
rect.pyx:18:27: Object of type 'c_Rectangle' has no attribute 'getLength'
rect.pyx:20:27: Object of type 'c_Rectangle' has no attribute 'getHeight'
rect.pyx:22:27: Object of type 'c_Rectangle' has no attribute 'getArea'
rect.pyx:24:20: Object of type 'c_Rectangle' has no attribute 'move'

BTW, I am using the latest stable version,

$ pyrexc --version
Pyrex version 0.9.6.4

Thank you very much!

Regards,

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cdef extern from "Rectangle.h":
    ctypedef struct c_Rectangle "Rectangle":
        int x0, y0, x1, y1
        int getLength()
        int getHeight()
        int getArea()
        void move(int dx, int dy)
    c_Rectangle *new_Rectangle "new Rectangle" (int x0, int y0, int x1, int y1)
    void del_Rectangle "delete" (c_Rectangle *rect)

cdef class Rectangle:
    cdef c_Rectangle *thisptr      # hold a C++ instance which we're wrapping
    def __cinit__(self, int x0, int y0, int x1, int y1):
        self.thisptr = new_Rectangle(x0, y0, x1, y1)
    def __dealloc__(self):
        del_Rectangle(self.thisptr)
    def getLength(self):
        return self.thisptr.getLength()
    def getHeight(self):
        return self.thisptr.getHeight()
    def getArea(self):
        return self.thisptr.getArea()
    def move(self, dx, dy):
        self.thisptr.move(dx, dy)