[flext] error while compiling parch PD

[alessandro mason]

Hi,
I'm trying to implement this external for pd:
#define FLEXT_SHARED 1
#define FLEXT_USE_CMEM 1
// include flext header
#include <flext.h>
// check for appropriate flext version
#if !defined(FLEXT_VERSION) || (FLEXT_VERSION < 401)
#error You need at least flext version 0.4.1
#endif

class plus: public flext_base
{
FLEXT_HEADER(plus,flext_base)

float f1,f2;

plus(float f): f1(0), f2(f) //costructor#
{
    AddInAnything("Bang or Number");
    AddInFloat("Argument");
    AddOutFloat("Result");

    FLEXT_ADDBANG(0, m_bang);  // add methods
    FLEXT_ADDMETHOD(0,m_float);
    FLEXT_ADDMETHOD(1,m_arg);
}

inline void m_bang() {ToOutFloat(0,f1+f2);}
inline void m_float(float f) {ToOutFloat(0,(f1=f)+f2);}
inline void m_arg(float f) {f2=f;}

FLEXT_CALLBACK(m_bang);  //callback wrappers
FLEXT_CALLBACK_F(m_float);
FLEXT_CALLBACK_F(m_arg);

};
FLEXT_NEW_1("plus",plus,float0) // set up class


When I compile the file occours a lot of errors like this:

obj\Release\main.o:main.cpp|| undefined reference to
`flext_obj_shared::obj_add(bool, bool, bool, bool, char const*, char const*,
void (*)(flext_class*), flext_obj_shared* (*)(int, _atom*), void
(*)(flext_hdr*), int, ...)'|.

How can I resolve this problem? Thanks

Mason Alessandro
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