__i_Object_s__drop undefined symbol

[Perrone Alessandro]

Hi all
Can anyone explain me how to "bypass" this error?
--
/usr/bin/ld: Undefined symbols:
__i_Object_s__drop
collect2: ld returned 1 exit status
make: *** [findImp] Error 1
----
here it is what I have understood.
1) The problem is defined into libDefObj and in particular to 
DefObject.m file.
The nm program says

[Alessandro-Perrones-Computer:swarm-2002-05-14/src/defobj] alex% nm 
-g DefObject.o | grep __i_Object_s__drop
         U __i_Object_s__drop
[Alessandro-Perrones-Computer:swarm-2002-05-14/src/defobj] alex%

2) the _i_Object_s_drop method is defined into the  macros.h

[Alessandro-Perrones-Computer:swarm-2002-05-14/src/defobj] alex% grep 
_i_Object_s__drop *.h
macros.h:extern void _i_Object_s__drop (struct Object_s *, struct 
objc_selector *);
macros.h:#define DROP(obj) _i_Object_s__drop (obj, M(drop))
[Alessandro-Perrones-Computer:swarm-2002-05-14/src/defobj] alex%

3) It is strange, but in the defobject.m it is included the file macros.h

#import <defobj/macros.h>


So I do not understand why there's the error.
Any hints?
Regards.
                                        ALEX

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