How to link a C extension module on Mac OS X?

[Fortepianissimo]

Just started learning how to write a C extension module on Mac OS X.
Here is a simple module taken from Programming Python:

---
#include <Python.h>
#include <string.h>

/* module functions */
static PyObject *                                 /* returns object */
message(PyObject *self, PyObject *args)           /* self unused in
modules */
{                                                 /* args from python
call */
    char *fromPython, result[64];
    if (! PyArg_Parse(args, "(s)", &fromPython))  /* convert Python ->
C */
        return NULL;                              /* null=raise
exception */
    else {
        strcpy(result, "Hello, ");                /* build up C string
*/
        strcat(result, fromPython);               /* add passed Python
string */
        return Py_BuildValue("s", result);        /* convert C ->
Python */
    }
}

/* registration table  */
static struct PyMethodDef hello_methods[] = {
    {"message", message, 1},       /* method name, C func ptr,
always-tuple */
    {NULL, NULL}                   /* end of table marker */
};
,
/* module initializer */
void inithello(  )                       /* called on first import */
{                                      /* name matters if loaded
dynamically */
    (void) Py_InitModule("hello", hello_methods);   /* mod name, table
ptr */
}
---

Then I did this

g++ -I/sw/include/python2.3 -dynamiclib -o hello.dylib hello.c 

and got this error message:

In file included from /sw/include/python2.3/Python.h:70,
                 from hello.c:6:
/sw/include/python2.3/objimpl.h:255: warning: use of `long double'
type; its
   size may change in a future release
/sw/include/python2.3/objimpl.h:255: warning: (Long double usage is
reported
   only once for each file.
/sw/include/python2.3/objimpl.h:255: warning: To disable this warning,
use
   -Wno-long-double.)
ld: Undefined symbols:
_PyArg_Parse
_Py_BuildValue
_Py_InitModule4
/usr/bin/libtool: internal link edit command failed



This is Mac OS X 10.2.6 with latest Fink installed. I guess the fetal
one is the ld reporting undefined symbols. Any tip? Thx.